Hello all, It has come to my attention that the A/C compressor will be engaged when the defroster is deployed. This being said I have the following questions:
1- If this is true, is the reason to utilize the evaporator as dehumidifier to rid the cabin air of its' moisture?
2- Will the aforementioned in Q #1 still occur if the A/C system is low on refrigerant. I ask this because most, if not all systems have a low refrigerant switch, preventing the compressor from engaging when refrigerant is low?

 

1. Yes.
2. Yes. Also if the temperature is below ~40F.

 

Thank you!!

 

If it's low on refrigerant, the compressor will short cycle, if it even turns on at all. Essentially no difference between what it will do in the normal or max A/C modes.