DIY: Unlink A/C from Defroster

[A-Dingo-Ate-My-Baby]

Originally Posted by lilpusher

hey there people. Yes the ac is a pump and robs power etc. however there is a really good reason it turrns on with the defrost. There is oil suspended in your refrigerant that keeps all those tight clearance parts in your expensive ac compressor running smooth. when your compressor doesn't run for say 8 months of the year the oil seeps down and parts seize up. when the pump blows you get to replace everything at a huge cost the engineers are smart so to prevent you from replacing your ac system every year or so they attached a trigger wire to your defrost to keep things lubed up. cheers.

well let me be the one to say this is BS

The defrost mode goes to A/C, BECAUSE

most people track snow and slush into the vehicle, and in the
winter the inside of a car becomes really humid, and often, ice forms
on the inside of the window as well as the outside in winter.

So, defrost mode activates A/C to assist taking care of this problem
of frost on the inside of the glass.