Car Smells Like Antifreeze When Heater Is On

my 06 gran prix 3. If one or more of these issues is present, your vehicle may blow out cool air rather than heat: Not enough coolant in the engine; Problems with the heater core. if not the heater core has most likey sprung a leak and will need to be replaced. Car Coolant. It only smells like antifreeze burning when I have driven the car. Can't see any spills or leaks from the engine bay or on the ground. Smelling the sweet scent outside the vehicle indicates that the coolant leak might be in a hose or the radiator. Do you smell the semi-sweet odor of antifreeze/coolant. Also, if you have a slimy film coating the inside of your windshield, that would tend to confirm that your heater core is leeching antifreeze into your cabin air stream. If your car smells sweet like pancake syrup, it is probably due to your antifreeze coolant that circulates in your car’s heater and/or defroster. Somewhere the exhaust was getting into the water jacket and that was pushing the coolant out. Quick Answer. The heater core is responsible for circulating warm air in the car’s passenger cabin. Ever since I bought my 2003 TF, there has been a strong smell of coolant when the car has had a good run (although I drove 3 or 4 before buying and all seemed to do the same). Occasional coolant smell and nearly imperceptible coolant loss was traced to the turbo. This is usually due to a heater core that is leaking. Looked under hood and there was antifreeze wetting every thing. If you do not service it it can be a lot worse. I have no clue what could have caused this. Car AC Smells like Burning Plastic When the air conditioning in your car blows out a burning plastic smell, you should check your car or have it looked it by a mechanic. Antifreeze has a sweet smell like pancake or maple syrup. I checked my coolant reservoir tank and it appears to be empty and I am not sure where to go from here. The remedy is spending 8 hours taking apart and reassembling the dashboard to change out the heater core or fusing two hoses. I smell it at the drivers door when, I shut off the car and get out. This would perfectly coincide with your smell of 'burning antifreeze' but no visible leaks :yes: My heater core hoses leak enough now to where they leave a puddle in the frame. Heat requests are usually drawing air from outdoors and any leaks COULD make an odor - even strong. Update: What will happen if I don't get it fixed right away?. Common problem for. I was outside applying coolant to an overheated car,though the coolant compartment had a leak so I applied it under the radiator cap. Ever since I bought my 2003 TF, there has been a strong smell of coolant when the car has had a good run (although I drove 3 or 4 before buying and all seemed to do the same). But after the new car smell dissipated, it smelled like coolant. No more smell, rock solid temp gage and a solved problem that I think has been like that at. A sweet-smelling aroma and antifreeze smell could indicate that the car's heater core is leaking. And the way it gets in is through a leaky heater core. When driving, the heat from the engine and air flow, will make the leaked coolant dry up almost right away. losing coolant and can smell antifreeze through the air vents once the engine is warmed up. Antifreeze smells sweet, and when it leaks into the heater box, that smell will get propagated throughout your car. Antifreeze flows through the engine and removes excess heat so that you don't have an engine meltdown. I get an odor which smells like coolant. I checked my coolant reservoir tank and it appears to be empty and I am not sure where to go from here. Auto Diagnosis - What's That Smell? Remember that new-car smell? Actually, new cars haven't had that smell since manufacturers took the solvents out of the glues in the interior in an attempt to. It goes to the line a third the way up and stays there. I just bought the car but, I can smell what I think is burning antifreeze after I park it in my garage. Could you figure out what to do if one headlight is out? What could you do to fix streaks from a windshield wiper or a sweet smell coming through the vents? If you can answer these questions, you just might be a true gearhead! There's only one way to find out! Take this quiz and let's see if you know your car symptoms and solutions!. There are several issues that may cause car smells from the heater core. Checking up on your coolant is easy to forget, but an engine’s coolant is just as important as oil when it comes to your car. In January of 2017 my coolant overflow tank started to get random pinholes throughout the. They all stem from a leak in the cooling system under the hood. You might also smell an oil leak before it is serious enough to leak onto the driveway. One night we were getting in her car and I let one go outside, it was a stinker. What's Causing That Smell in My Car? By Rick Popely. the only thing that smells like anti freeze is the air coming from the vents. I know in other cars I've owned this is usually a heater core issue scent. corolla 2014 when heater is on i get a smell like antifreeze inside what could be the problem - when using the heater i get a antifreeze smell in the insid × We use cookies to help our site to work, to help us understand how it is used, and to tailor advertising on this and other sites. If you are smelling antifreeze inside the vehicle, there's a 90% chance it's a heater core issue. What Happens To A Car Without Coolant Or Antifreeze?. If your car smells like antifreeze but not overheating, the components you should look into are: 1. In the forum you will find an informative tech area, a place for Member’s journals, Vendors with special Members pricing, and more!. It's like hitting your head against a brick wall and. Antifreeze can smell like fish, and it CAN leak into the car through the heating system. Everyday (when its cold) as my car is warming up with the heater on defrost, I get a sweet smell coming from the vents. i have a very strong coolant smell inside the car when heat is on and a strong coolant smell outside of the car. If one or more of these issues is present, your vehicle may blow out cool air rather than heat: Not enough coolant in the engine; Problems with the heater core. Unfortunately I bought it privately and lets say the previous owner wasn't too forthcoming with the truth!. IGOTACUMMINS is an online forum and community for all Cummins Turbo Diesel enthusiasts. coolant smell but no obvious leak Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine. This kind of a problem means it's a good idea to take your car into a professional. It may be from toxic liquid ethylene glycol, otherwise known as antifreeze or engine coolant. People often find plastic bags and other objects stuck in the engine, causing the frustrating issue that car smells like burning plastic. On occasion, other antifreeze leaks can be smelled inside the car while driving because the fumes are pulled in through the cabin air intake. There’s no obvious green, brown or black gunk. Smelling the sweet scent outside the vehicle indicates that the coolant leak might be in a hose or the radiator. Sweet-smelling (but toxic) ethylene glycol is leaking from somewhere. No coolant on the ground. The mold isn’t visible. Yeah when i turn on the air/heat i smell anti freeze. Antifreeze gets very hot and will start to steam, especially if it's spraying onto a hot engine or running down a hot radiator. It is much more noticeable when the heat is on, of course. Many people find that a plastic bag stuck in the engine will create a burning smell. If the smell is coming from inside the car only when the heater is turned on, the problem is either with the heater core or the heater hose. It sounds like a leaky heater core, Brenda. (less in the winter) I'm fussy about my coolant level. You could also check for coolant dripping from the AC condensate drain. Like the titel says I have a leak somewhere in the front of my 98 S70 N/A (170,000 miles) on the passenger side. A year ago I sealed an external leak where the heater core mated up to the in an out lines. If you do not service it it can be a lot worse. I'm just going through this with my Jaguar XJ8 daily driver. AC Smells Like: Burning. Starts/idles/drives great. It's mixed in with the r134 and smells a little like atf. Replace drain plug. Protecting your radiator To protect your cooling system from these harmful and eventually costly damages, flush the system at least every 30,000 miles or 2 years. What's Causing That Smell in My Car? By Rick Popely. Does it smell like burning antifreeze? Usally it means that the heater-core is going bad. You will end up with Anitfreeze all over you passenger. Pulled over to the side and the coolant cap was loose and looked like it had splashed over the engine bay. In other words, look or 'feel' for a wetness on the passenger side of the floorboard. Unlike antifreezes used for automotive application, assortment of boat antifreezes is more complex. I think maybe you have a slight leak in the coil(s) of your heater, and when you activate the *heating* system, the hot engine coolant that is diverted off of the water circulating pump begins to leak -- probably in a small spray that evaporates in the fan-blown air circulation and releases an unpleasant hot anti-freeze-laden-vapor smell into the car's passenger compartments. This is normally in the heater motor. She gets in an immediately goes “WTF is that smell? It smells like rotting fruit in here!”. My coolant levels are fine and I can't seem to find any leaks. There are several issues that may cause car smells from the heater core. you may also have a blown head gasket. Lower radiator hose Thermostat Upper radiatorhose Radiator. Then a few miles later the oil temp and coolant temp warnings started to flash (300 degrees for the oil temp) and could smell coolant. Electrical Short. If there’s a leak in the heater core, you’ll likely notice the smell of antifreeze inside your vehicle. After warming up it runs normal. Does it smell like burning antifreeze? Usally it means that the heater-core is going bad. Putting some context to the other answers here: * Your car heater contains a loop that splits off the circulating coolant (anti-freeze) in your engine. It might also mean you missed your pancakes when you were pouring syrup. while waitin i noticed the car heated up but the air never di. Home \ Repairs & Maintenance \ f250 diesel antifreeze smell my buddy has a 99 f250 diesel with the 7. The heater core doesn't seem to be leaking in the floor. 2012 Chevy Cruze purchased in August 2012. In late 2016 my upper heater hose swelled up like a balloon, and then burst, another 150 dollar repair. Coolant leaks will cause the coolant to drip on the hot engine, resulting in the burning smell and a thick white smoke. If you start the car before the coolant has a chance to evaporate, you will see white smoke which smells like antifreeze coming from the exhaust. Burning Smell: You will get some burning smell when your car engine gets extremely hot. 2005 tj smells like coolant when air/heat is on. For a long time you will still smell the glycol, so I would bite the bullet and pull it out and get it fixed, unless you like the smell of glycol in the morning. I am having a coolant smell from under the hood which is more evident when the fan kicks on. Antifreeze smell and vapor coming through vents - 1996 Jeep. And the way it gets in is through a leaky heater core. Over time, maybe 5 ounces of coolant dripped on the indoor garage floor Inspection of the engine compartment showed no tell-tale clue to the source of the leak but after removing the center plastic cover from beneath the car I could see minor moisture. I Added antifreeze several times. Antifreeze smell and vapor coming through vents - 1996 Jeep. The erratic heater operation is explained by hot coolant passing through the matrix and giving heat and then going cold as air passes through. Home \ Repairs & Maintenance \ f250 diesel antifreeze smell my buddy has a 99 f250 diesel with the 7. When that heater core gets a leak (usually pinhole size), the coolant make the sweet smell like syrup. Mention the smell when you drop the car off and ask them to check if you may have a small leak on the heater. What's Causing That Smell in My Car? By Rick Popely. vw golf mk4 139,000 miles - turn heat on smells like antifreeze but its on and off, it doesn't always smell like anti-freeze. Replacing a broken pipe or hose is often quite simple and fairly inexpensive. Its been making the smell since the day I bought it. It smells like coolant. It only smells like antifreeze burning when I have driven the car. Electrical Short. If this is the case, small leak in the radiator, or hose in the engine bay, when the coolant evaporates, if you you have A/C set to outside air, the 'sweet' smell of the evaporated coolant will be sucked into the cowl. Its bad enough as soon as I drop my window at a drive thru for example I smell it. 2005 tj smells like coolant when air/heat is on. In January of 2017 my coolant overflow tank started to get random pinholes throughout the. No coolant on the ground. You also need to know tailpipe is clear and exhaust system is good. I'm assuming it's a sweet smell?. It might also mean you missed your pancakes when you were pouring syrup. Re: Burning Fluid Smell - Oil or Antifreeze? Hi Guys, I have found a cure for the burning oils smell when the car is idling with the heater or air con on. This may lead to some serious problems and damage to your car, so fixing it as soon as noted might save you from some unnecessary expenses. Because coolant absorbs the heat generated by the engine and transports it to the radiator to cool down, it stands to reason that low or weak coolant levels mean its job performance is compromised and your car can overheat. I had one in my car that developed a very slow leak along the bottom seam. The heater core is responsible for circulating warm air in the car's passenger cabin. Took it to mechanic who replaced the. Look carefully at clamped connections. If the heater core of your vehicle is leaking antifreeze, that can cause a fairly intense smell inside your car. Antifreeze has a sweet smell like pancake or maple syrup. This is normally in the heater motor. It's coming from under the hood. probably got a dose of coolant laden air through the fresh air vent when the top hose blew, once coolant is on the heater core it will smell like coolant for ever until U pull the core and thoroughly clean it. What is smells like: Refrigerant smells a little like the coolant in a car radiator because coolant is a type of refrigerant. Now it will smell like sugary koolaid in the coolant tank. vw golf mk4 139,000 miles - turn heat on smells like antifreeze but its on and off, it doesn't always smell like anti-freeze. However, maybe the heater itself is broken and the. If you do not service it it can be a lot worse. you may also have a blown head gasket. It seems they built the car around that core. The heater core is responsible for circulating warm air in the car's passenger cabin. The smell goes away shortly after being started but always returns when I re-start. coming from the rear of the car. I think it's a heater core, but there is no quote on your site to fix that specifically, just upper or lower hoses. If the smell is noticeable inside the vehicle, the heater core is likely to be leaking. A crack in the heater core will discharge antifreeze and you will get the odor inside. The heater core of your vehicle contains an antifreeze and water mixture, and it uses this mixture to regulate the temperature of the air inside your car. The heater core in your vehicle is important for keeping the inside of your vehicle warm: it pulls heat out of the coolant system in your vehicle an circulates that heat inside of your car. Occasional coolant smell and nearly imperceptible coolant loss was traced to the turbo. this usually can indicate a couple things. Replacing the A/C core, for instance is about 10 hours labor, since the whole dash has to come out. When that heater core gets a leak (usually pinhole size), the coolant make the sweet smell like syrup. 5L v6 engine is loosing anti-freeze. Sweet smelling exhaust There are plenty of smells emanating from your car and some of them are perfectly normal, even if they are annoying. Looked under hood and there was antifreeze wetting every thing. I took it to a mechanic who said my heater core needs replacing. If you are smelling antifreeze inside the vehicle, there's a 90% chance it's a heater core issue. Then I noticed steam or smoke coming from my A/C vents and pulled of the freeway and it stopped. Please register to post and access all features of our very popular forum. You can also have parts of the heater core itself melt which causes a burning smell. Antifreeze flows through the engine and removes excess heat so that you don't have an engine meltdown. my 06 gran prix 3. I let him do this for $800. Electrical Short. However, I am NOT losing any coolant. It smells like coolant after it warms up to temp. Basically it is the cam covers leaking oil slightly from the bottom corners nearest the bulkhead, onto the exhaust manifolds. Actually kind of having the same issue, except mine is retaining the coolant I put in it. The heater core in your vehicle is important for keeping the inside of your vehicle warm: it pulls heat out of the coolant system in your vehicle an circulates that heat inside of your car. There's a coolant smell that comes off the engine and can smell it while driving. i come from class turn the car on n wait for my windows to defrost. I tried Blue Devil after reading a lot on it, the leaking has stopped and I haven't had to put any new coolant in in two weeks, but there is now a strong smell of coolant whether I run the A/C or the heater. ” “When I park my car and walk by the hood it smells. Antifreeze can smell like fish, and it CAN leak into the car through the heating system. Can someone describe it? I think I will try to find a bottle of coolant and smell it. Antifreeze was developed to overcome the shortcomings of water as a heat transfer fluid. How To Choose The Right Car Coolant. 2005 tj smells like coolant when air/heat is on. I think it's a heater core, but there is no quote on your site to fix that specifically, just upper or lower hoses. In late 2016 my upper heater hose swelled up like a balloon, and then burst, another 150 dollar repair. A lift is a very handy thing to have for the obvious things, oil changes and hot rod mods but it's also helpful for cleaning and inspections as well. It is designed to prevent the coolant from flowing until the coolant reaches a certain temp. This smell might mean that your coolant is leaking from somewhere like a radiator or heater hose. You will end up with Anitfreeze all over you passenger. So, you will get plastic/rubber burning smell. 5L v6 engine is loosing anti-freeze. It wasn’t obvious because it was under the removable rubber mats and was there until we noticed a fungus-like smell. From the location you give it could be oil leaking out from the valve cover which while it may sound serious is likely just a gasket that needs replacing ($20 or so in parts). AC Smells Like: Burning. Smells almost like syrup. Question: Low coolant level warning problem with my 2007 Pontiac G6 3. Somewhere the exhaust was getting into the water jacket and that was pushing the coolant out. Last month, the low coolant light came on. If the heater core of your vehicle is leaking antifreeze, that can cause a fairly intense smell inside your car. The Heater Core. Your light is on because the fluid level is low, and lower when you are pushing extra coolant to the core. No coolant on the ground. ” “I see blue liquid under the front of my car. It contains ethylene glycol which can give off a sweet scent. If you use an additive to try and stop the leak it might do it but it hasn't fixed the problem. My car has 118000 miles. They put a little pressure in it, and said the hose near the firewall by the heater valve had a loose clamp (fairly common overlooked one on these legends) tightened it, and put a new thermostat in at no/charge just in case. Check the coolant overflow bottle. RAY: The heater core is a little radiator that sits underneath the dashboard. The Engine Coolant Temperature Sensor (“ECT” for short) is an analog sensor which, as it’s name says, measures the temperature of the coolant and feeds this data to the on-board computer. This is due to the build up heat of plastic insulation on wires, causing melting and the burning smell in your unit. Do you smell the semi-sweet odor of antifreeze/coolant. This may lead to some serious problems and damage to your car, so fixing it as soon as noted might save you from some unnecessary expenses. It might also mean you missed your pancakes when you were pouring syrup. I got my car back from the dealership the afternoon of January 29th. The next step is to find out where the water has escaped from - leaking hose, leaking heater matrix (should smell inside cabin if so) Leaking filler cap,. I've noticed that sometimes when the car is in idle, white smoke comes out under the glove compartment, it comes out as a thin thread of white smoke that smells like burning antifreeze. A green damp spot on the front passenger side carpet or mat is usually evidence of the leak. If the heater core of your vehicle is leaking antifreeze, that can cause a fairly intense smell inside your car. If smells like rotten eggs/petrol and air, probably an exhaust leak. Hot coolant from the engine flows through there and transfers heat to the. Three times the engine was cold, once warm. However, maybe the heater itself is broken and the. A small amount of hot coolant is diverted into a hose fitted into the firewall and then into a small heat exchanger or heater core. FYI most car AC holds only around 2 lbs of refrigerant. The temperature gauge is fine and no warning lights come on. But if the radiator has a leak, there will be insufficient coolant to cool the engine temperature of your car. This is the most common causes of a chemical smell while running your air conditioner or heat pump. I took it to a mechanic who said my heater core needs replacing. com I have been to his seminars as well as watched many of his programs and he is a wealth of info. Auto Diagnosis - What's That Smell? Remember that new-car smell? Actually, new cars haven't had that smell since manufacturers took the solvents out of the glues in the interior in an attempt to. 2013 Chevy Cruze, I have an awful order which smells like antifreeze coming from from the vents mostly when the heat or A/C is. Whether your car heater or A/C smells sickly sweet, simply stale, acrid like burning rubber, or distinctly urine-tinged, all of these different gross car heater smells can be associated with a specific problem, which means each also has its own specific fix. On cars of this type, I generally consider that coolant addition is needed about every three months. It is much more noticeable when the heat is on, of course. It is usually fixed as soon as the truck starts moving or I give it a little time so never investigated until now. this smell disapates while driveing and just started during our recent cold snap -20 degrees below zero. No smell of antifreeze in the car at all, the floors are dry and no extra moisture when using the defroster. Turn on a hot water tap until no more air spurts from the line, then flush until no more antifreeze smell or taste. If you do not service it it can be a lot worse. Then, it delivers that same heat to your tootsies when you turn on the heater. Not a single thing has not been changed in regards to the coolant circuit and I can STILL smell coolant very faintly when the heat is on. There’s no obvious green, brown or black gunk. I drove 50 miles this morning, used the heat and the defrost (both working HOT)…there was a faint smell of antifreeze in the cab BUT the engine smelled like burning antifreeze (the temp of the car went from cold to the proper range - the middle…). When you drive the car and have defrost mode on, does the windshield steam up from the vents and smell a. The corrosion inhibitor stuff, that does wear out after a few years, that's why the flush ritual. But if the burning smell from car still presents even after you use the heater regularly, then you may have particles or some debris clogging the vent. if not, you could have a coolant leak in the motor and/or hoses and you smell it as it evaporates from the engine heat. Coolant that smells like fuel. A lift is a very handy thing to have for the obvious things, oil changes and hot rod mods but it's also helpful for cleaning and inspections as well. Replacing the A/C core, for instance is about 10 hours labor, since the whole dash has to come out. There isn't any overheating etc. The mold isn’t visible. The flap had fallen off it and it was letting exhaust fumes and other fumes into the car. If one or more of these issues is present, your vehicle may blow out cool air rather than heat: Not enough coolant in the engine; Problems with the heater core. Is this normal? Is it possible that coolant was spilled somewhere and this is/was causing this? Don't tell me that it's a headgasket!!! Thanks. 3 engine and you may notice a strong burnt coolant smell. This is normally in the heater motor. if it is, it is definantly your heater core since its located right behind the dash on the passenger side. It doesn't take much to smell antifreeze and it probably evaporates before you would see any trace of a leak. I drove 50 miles this morning, used the heat and the defrost (both working HOT)…there was a faint smell of antifreeze in the cab BUT the engine smelled like burning antifreeze (the temp of the car went from cold to the proper range - the middle…). losing coolant and can smell antifreeze through the air vents once the engine is warmed up. Because coolant absorbs the heat generated by the engine and transports it to the radiator to cool down, it stands to reason that low or weak coolant levels mean its job performance is compromised and your car can overheat. The radiator has the coolant/antifreeze, which keeps the engine cool. If you are smelling antifreeze inside the vehicle, there's a 90% chance it's a heater core issue. I'm going to check the coolant tank and oil level when the truck cools down a bit more. “I noticed a chemical type odor coming through the heater vents. When you turn the heat on a door opens up that diverts the air over the heater core that will heat the air and pass it through into the cabin. Other common signs of a bad heater core include a foggy windshield, a water surging sound inside the dashboard and wet carpeting on the front passenger side. I'm going to check the coolant tank and oil level when the truck cools down a bit more. The heater core of your vehicle contains an antifreeze and water mixture, and it uses this mixture to regulate the temperature of the air inside your car. Yep definitely smell coolant What the hell GM? Seriously, what the hell? Also, actually edited this video outside of youtube In windows video editor. Turn on your heater and if it smells ten time worst that thats it. Coolant that smells like fuel. Common problem for. Also coolant sounding like it's boiling My car has an automatic transmission. I have an 06 Chevy Impala. TOM: It's not smoke. But you can put your nose up to the vent and smell an odor. No oil in the radiator. As soon as step on the gas and start moving, it dissipates. Chevrolet Cruze Coolant Leak Causes Bad Smell for Drivers Published on February 27th, 2017 A number of Chevrolet Cruze drivers have reported a bad odor coming from their vehicle while the heater is running. This kind of a problem means it's a good idea to take your car into a professional. This would perfectly coincide with your smell of 'burning antifreeze' but no visible leaks :yes: My heater core hoses leak enough now to where they leave a puddle in the frame. ” “I see blue liquid under the front of my car. A small amount of hot coolant is diverted into a hose fitted into the firewall and then into a small heat exchanger or heater core. I say slightly because if it smells very gassy you may have other problems that need to be looked into. Question: Low coolant level warning problem with my 2007 Pontiac G6 3. An indication of a failing or leaking heater core is the smell of coolant inside the car. If the heater core of your vehicle is leaking antifreeze, that can cause a fairly intense smell inside your car. The water and oil look good could it still be the head gasket. corolla 2014 when heater is on i get a smell like antifreeze inside what could be the problem - when using the heater i get a antifreeze smell in the insid × We use cookies to help our site to work, to help us understand how it is used, and to tailor advertising on this and other sites. It is usually fixed as soon as the truck starts moving or I give it a little time so never investigated until now. Anti-freeze smell is a very sweet smell and is usually detected inside the vehicle. I had a smell in my 01 and it took me months to figure out it was a vent in the passenger side trunk. This kind of a problem means it's a good idea to take your car into a professional. The heater itself could be broken causing a burning smell from the antifreeze that is leaking into the heater vents. I'm going to check the coolant tank and oil level when the truck cools down a bit more. The heater core is responsible for circulating warm air in the car’s passenger cabin. The car has not overheated and I don't notice any leaks at all I believe the smell is decreasing as time goes along. Coolant level is fine, I haven't had to top it off, the overflow bottle is fine. Like Aurin suggests it could be coolant but there is several other types. This is the smell of your radiator fluid and definitely a sign that coolant is leaking into your car. Basically it is the cam covers leaking oil slightly from the bottom corners nearest the bulkhead, onto the exhaust manifolds. Sounds like you have a leaking heater core. If you notice your heater is producing an antifreeze burning smell then there is a good chance that antifreeze is leaking into the heating system. Antifreeze Smell Inside My Car With Heater On Today I have noticed a slight antifreeze type of smell (kinda sweet) inside my car when I turn on the heater. Last night after a 20 mile commute - I popped the hood and heard a "sizzling" kinda sounded like an air leak, it was coming from the coolant reservoir cap. It smells worse when the heat is on and hasn't gotten worse in that time and only requires adding a little extra coolant to the overflow every few months. One of my good classic car pals lost a $5000 honeycomb radiator to permanent antifreeze. Sweet-smelling (but toxic) ethylene glycol is leaking from somewhere. * A sickly sweet smell –. Typically the way a heater in a car works is that there a small valve that allows hot coolant from the engine to enter a smaller secondary radiator called the heater core, which is usually located in the lower center. But if your car’s heater suddenly stops working in the middle of winter, it can make it downright miserable. Checking up on your coolant is easy to forget, but an engine’s coolant is just as important as oil when it comes to your car. this usually can indicate a couple things. Its a raw smell of fuel coming out, not anti-freeze. coolant smell but no obvious leak Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine. Turn the car on and then turn the heater on high to determine if the antifreeze smell is coming from inside or outside the car. no heat with antifreeze smell 5 Answers. A sweet-smelling aroma and antifreeze smell could indicate that the car's heater core is leaking. The heater core of your vehicle contains an antifreeze and water mixture, and it uses this mixture to regulate the temperature of the air inside your car. I vacuumed the water out with a wet dry vacuum and let the car air dry. Like the titel says I have a leak somewhere in the front of my 98 S70 N/A (170,000 miles) on the passenger side. The upper radiator hose, thermostat housing, lower radiator hose, heater core hoses, broken radiator, broken coolant reservoir can all contribute to coolant smell when these components start to leak. A leak big enough for you to smell would let all the refrigerant out in a few minutes and you would hear a hissing sound. If it's smells sweet, could very well be the heater core. If this is the case, small leak in the radiator, or hose in the engine bay, when the coolant evaporates, if you you have A/C set to outside air, the 'sweet' smell of the evaporated coolant will be sucked into the cowl. Whether your car heater or A/C smells sickly sweet, simply stale, acrid like burning rubber, or distinctly urine-tinged, all of these different gross car heater smells can be associated with a specific problem, which means each also has its own specific fix. Here's a example of one of my experiences. Antifreeze gets very hot and will start to steam, especially if it's spraying onto a hot engine or running down a hot radiator. Sounds like you have a leaking heater core. When it goes low, the heater wont blow warm air when sitting at an idle. This coolant odor goes away after a few minutes (about 5 to 10 minutes) after the heating system starts to blow hot air into the car's cabin. RAY: The heater core is a little radiator that sits underneath the dashboard. i brought it in to my dealership and they determined the water pump was leaking and they replaced it. The odor itself will typically drift in through the AC ducts, and it may not last for too long, as the burnt fuse doesn’t make a continuous smells like some of the other problems on this list.