[obermd]

It doesn't matter if you run recirc or fresh air. It only takes a little mold/mildew to get the process started and once started the only way to get rid of it is to fumigate the HVAC ducting. Also, the dealership should turn on the HVAC after-blow to dry the ducting after you turn off the car.

 

[obermd]

Afterblow turns the HVAC blower on and off after you turn the car off. It starts about 15 minutes after shutdown and continues for about an hour. There is BCM flag that needs to be set to turn it on. It makes the whine many of us hear after turning our cars off sound like nothing. Afterblow is loud. It can also drain your battery so if your car spends a lot of time driving very short distances you don't want to turn it on.

 

[obermd]

Define short. If the engine reached temperature you're probably ok with the power drain from after blow.

 

[obermd]

Just consider it toe cologne to "mask" the coolant odor (wink,wink).

Been there, done that. The mold/mildew smell masks the HVAC ducting glycol odor extremely well.