I was reading up on the difference between modes on the climate control system and wanted to know what people's thoughts are between setting the recirculation modes....A, M, or no light on at all.
A mode, if illuminated, is supposed to detect external pollutants and automatically close off external air.
M mode, if illuminated, shuts off all outside air and is full recirculation mode until a sensor supposedly detects moisture that can cause fogging and turn A mode back on again.
Both lights off means full outside air at all times.
I've my suspicions that A mode just doesn't work because unless I have the mode set to M, I always detect and smell external odors be it exhaust fumes, smells from passing a restaurant, etc. So I'm not sure if there even is a sensor that detects external pollutants and such things.