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Good morning fam! I have a 2014 gmc sierra 5.3l 2wd that is having ac problems. when the compressor is commanded on when pressing the ac button it engages for for a few seconds then starts to screech really loud until you turn it off. First thing was replace the compressor which I did and I also did the complete kit including condenser only to realize its doing it again. So I noticed when i disconnected the pressure control solenoid it doesn't scream for help only until i plug it back in. Im wondering if the HVAC control module could be faulty or how could iu test the pressure solenoid with a scope to see if there is something going on with the circuits or module itself? Andy feedback would be awesome thank you in advance.
Last edit: 2 hours 23 minutes ago by WrenchWizard88.
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