Tip & How-To about 2006 BMW 550I

Smell from A/C

The smell from the A/C system is from bacteria on the evaporator. For the same reason one puts distilled water in cigar humidors and room humidifiers to avoid this, there's bacteria in the condensation that forms on the evaporator. Clean your evaporator. Possible solution is to the turn up the heat on the A/C and have it blasting to kill the bacteria that resides in your A/C vent system.

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You don't put water anywhere

If you have a coolant system leak, you have it repaired

If your adding to the system for some reason,you add a 50/50 or 60/40 mix of coolant & distilled water

Ask your neighbor to show you where the coolant mix goes,every car is different

Jan 30, 2013 | 1996 Mercedes-Benz E-Class

1 Answer

my mazda 6 v6 2004 smell oil when starting ventilation

The smell is typical of older Mazda aircon.
Purchase an aircon cleaning spray which is discharged into the aircon system by selecting recirc , cloing the windows for 5 minutes . This cleanses the system which is probably contaminated with bacteria.
Recharging your air con will help as well. The smell is due to evaporate condensed water mixed with sludge and bacteria .

Sep 20, 2011 | 2004 Mazda 6

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HI, Every time i run the a/c and turn it on after a day or so i get that condensation smell coming from the vents.. is there any solution , i have tried changing the cabin filters but the smell is still there! pleae help

The evaporator (normally in with the heater matrix) unit cools the warm air and at this point it gives up its moisture and that drains out from tubes and drips out under the car unfortunately some times
a bacteria can form
There is a disinfectant on the market that you can spray into the intake to the
air con system to coat the evaporator and cure this fault

Oct 27, 2010 | 2004 Hyundai XG350

1 Answer


Your drain hose is under towards the bottom of the car, up against the firewall. You may be able to blow it out from the cowl. You may just have to do a fresh air service which is a special foam that kills the bacteria and such that builds on the evaporator from it sitting.

Jul 23, 2009 | Jaguar S-Type Cars & Trucks

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