A SMELL COMING FROM AIR VENTS?? LIKE A MOLDY SMELL
Change air filter
does your car have air conditoning? if so bacteria can build up in the interior heater air distribution pipes and system as they like the cold produced by the a/c system. you can buy air con de-odourisers which you either spray directlly into the heater air intake or the other version is a aerosol with a locking button that emptys the entire contents over about 5 mins with the a/c system on cold, recirc on, heater blower on full and all interior air vents open. this will kill the bacteria and should solve the problem
I just responded to a similar thread: In some climates, using the Air Conditioning, then immediately turning the car off can cause mildew and a bad smell. To prevent it from happening in the first place, always turn off your A/C about 1 or 2 minutes before you park, and put the fan on high blowing ambient air. If you can't seem to get rid of the smell, I'd suggest running the heat on high for 5 minutes or so. Failing that, you can clean the A/C coils under the dash or turn it on re-circulate and spray Lysol in the ducts.
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