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Are you loosing radiator fluid. sometimes the heater core will rupture and you will smell burn odor. also check for strange rubbing sounds or screeching coming from the blower fan motor. or engine exhaust manifolds are hot when car is on, make sure nothing is leaning on them which will cause a burn odor. Any odor coming from outside will find it's way inside through the fresh air vents.
Is it a bad smell or a sweet like maple syrup smell. If its sweet you got a coolant leak probably heater core. Bad smell possible causes burning something up. I would run some water in the in the air intake below your wipers just to see if it changes. Not much but a little. Better or worse in cold tempers. Hwo about when the car first start or has run awhile does the smell get better or worse. More feed back please.
It is possible that something got spilled onto the exhaust manifold and is burning off. If the smell doesn't go away with a bit of time make sure there is not an oil leak or other fluid leak underhood. Another possibility is that an animal had climbed into the engine compartment and had made some sort of a mess - I have seen it happen before and critters can make a mess sometimes.
Not sure what a burning header smells like, but I would expect two possible smells. First, if the blower motor itself is going, you might smell the windings getting hot - like a transformer burning. If this were the case I would expect that the motor wouldn't spin on the low speeds.
The other smell you sometimes get is when the heater core leaks. Then you will get a coolant smell inside the car and sometimes (usually) a wet carpet as well.
your heater core is definitley leaking and your blower is pushing the vapor into the cabin. It will only get worse. You can minimize the smell by not running your heater or defroster, but you wont prevent the coolant from leaking and potentially getting worse. Sorry to say, the core will need pulled and repaired or replaced. Sometimes stop leak additives will solve the problem if its not too severe. I have never been a fan of them, its only a band aid in my view. also if u got pets afoid leeting they smell the antifreeze very toxic can kill pets easily. hope this helps. rate above 4* cheers
these guys are retarded, could be the fuse, could be the relay, could be the fan control unit, could be the resistor, could be the fan motor itself. if the heater core was leaking, you would still have heat, you would just smell coolant, if it was leaking enough to not have heat you would see it on your floorboard.