2007 Silverado A/C issues

[Jay Green]

I’m in FL so it’s HOT. A few weeks ago my AC started working intermittently until it finally stopped blowing cold altogether. Noticed a leak from the accumulator and the fans not working. Replaced both & now I have AC BUT either in motion or parked, every time I hit the accelerator, the AC turns off and it goes from recirculating to outside air INSTANTLY. I don’t know if it’s related but now after the vehicle sits for a while, the center mirror will read something outrageous like 140 degrees and then just start dropping. I tried resetting by pulling the fuse as directed for resetting but I’m still having the same issue. I’m going on a long trip and really need AC. Anybody have any ideas?

[richard wysong]

Welcome to the forum! Did you recharge it with the correct weight of R134 after vacuuming the system for at least 30 minutes?

[Jay Green]

Yeah but me and the boss are going to do it again Monday. Would this cause all the weird electrical fritzy stuff? I have my boss doing most of the Freon side of it as he has more experience. I’m leaving for my trip in 5 days and am trying to get as many ideas/tests as possible so I can run through them all at once and hopefully solve this before I have to set off. 

[richard wysong]

Yeah but is he using a scale or 12oz cans so he knows how much R134 he's putting in the system or just going by pressures? any codes?

Edited August 13, 2023 by richard wysong

[dna9656]

Maybe  the low pressure switch is playing a role. Richard has a point, you need a scale to add the right amount of stuff. Digital scales can prolly be had at Harbor Freight, it's worth checking out.