Smelly AC

jmg · 08-14-2017, 09:11 AM

Quote:

Originally Posted by perryo91

Quote:

Originally Posted by jmg

Leaving cool air inside the duct when you turn the car off makes that cool air start to warm. When cool air is warmed, evaporation occurs. That means that if there was any moisture int he ducts, than the process effectively dries it. So yes you should dry up the system by leaving cool air in the system to evaporate any remaining moisture if any. That means don't turn the AC off before you turn the car off. "[/I]

On the flip side, introducing warm air into the system while the ducts are cool will actually cause condensation and moisture inside the ducts. That's what causes mold and mildew.

I thought when you warmed cool air condensation would occur- the way I think about it is if I stick a glass cup in the freezer/fridge, then pull it out into ambient temperature (kitchen) after about 30 seconds the surface will be wet. Or like the coke can example you wrote.

The point of running the car with the AC off, i think, for about a minute/two is so the ambient temperature of the AC system becomes the same as outside by the time you park- so that condensation can happen while moving with the wind helping.

Condensation occurs when cooling warm air.