bad smell from bmw air vents

kieran160

Registered User
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68
i have a 2004 3 series and lately there has been a very bad smell coming from the air vents, the smell is not as bad if the air con is switched on. any suggestions on what the cause may be and how to fix it?

thanks in advance
 
Is the coolant level ok? It could be the heater matrix leaking into the heating ducts. It usually smells like pee very disgusting smell.
 
check the pollen filter normally just below the windscreen under some covers.

Maybe a critter got in somewhere and died and the smell is being stirred.

Make sure the drains under the windscreen are not blocked trapping stale water.
 
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