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It's most likely your heater core that is causing the problem it could be leaking either from the core it's self causing anti freeze to get into your vents or from one of the hoses leading to it.....I am assuming that when your heat is on there is a dampness in the air this is what is causing the windows to fog up.
does this happen when snow is sucked into the vents or does it happen all the time. If it happens all the time it could be a leaking heater core. if the windsheld has a film on it and smells sweet like anti freeze you have a leak in the heating system
You need to check your heater core, these commonly leak which will let anti-freeze into the cabin and can cause you engine to overheat and cause damage to the motor. Check the carpet in the footwells for moisture.
if you r getting smell in car and fog on windshield, with known history for common problem, you have a heater core leaking, You could try a stop leak from a parts supplier, but you need a heater core, and is a rather big job, as entire dash needs to be pulled back to axcess
try stop leak, if that doesn't fix, you didn't waste alot of time and money
good luck, and if you wanna tackle job, let me know i will send guided steps to help you along
Sounds like a possible heater core failure(hole in it) the smell indicates to me the coolant(anti-freeze) is leaking into the passenger compartment. Check the carpet in front of the front passenger seat for moisture, this would confirm heater core leak. Good luck !
A car this new should have a warranty right? the only other place for anti-freeze to go is through a blown headgasket into your oil. Pull out your oil dipstick and make sure it is not milky in color. If not check behind the engine and see if any coolant lines going into the firewall are leaking. When inside the car do you smell steaming coolant(anti-freeze) or hear gurgling? The temp gauge that stays on is the overheat indicator?
The mildew smell you refer to could be anti-freeze. When a heater core starts leaking it may allow anti-freeze (which circulates through it for heat) to be blown through the ducts onto the windshield in defrost mode. The repair is to have the heater core replaced. It may wait for the thermostat to open and allow the coolant to circulate before you notice it. Occasionally the carpet on the passenger side may be wet from leakage.
If you notice a 'sweet' smell, or windows tend to fog up, it's your cars heater core leaking. The heater core is located under the dash, passenger side, it's like a mini radiator. The cars cooling system directs hot coolant to it so you can have heat. To change it is an involved procedure. If there is no evidence of the anti-freeze smell or windows fogging up, and u have been using your air conditioner, it would be a blockage in the drain tube from the a/c. The end of the tube is located under the car on the passenger side , behind the front wheel. The blockage needs to be removed, and will solve the problem. Let me know what u find Curt
Sticky film on inside of windshield and smell of antifreeze is a sign of heater core leak. Make sure hose connections at firewall are not the culprit before you take more drastic measures.
The early sign of a heater core leak is the smell of coolant, the reason is that only vapor is leaking now, it will gradually get worse in most cases and coolant will start comming out the heater box condensation drain.
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