2020 Yukon.A/C not working, low pressure PSI is at 20, and just gets lower when I attach the Avalanche AC Recharge…

[Bigell]

Maaaan, I have a 2020 Yukon, and the AC decided to crap out yesterday on probably the last hot day of the year out here in PA. It looks like the unit isn’t engaging at all, just blows semi-hot air. I used the Avalanche Recharge canister, and the PSI on the low pressure side doesn’t go past 19, just gets lower and lower.
@Bigell

 

[42ezra]

2020 Tahoe Z71 A/C failed around 70K, went to the dealer, got soaked, but my A/C works fine now.

 

[SubTX]

If you're low on freon and the compressor cycles, the pressure will drop. Only when enough freon is in the system will the pressures start rising. You'll still need to add more to get the proper pressures. Find someone with a full gauge set in order to do this properly but if you add freon until the low side reads 25-35 psi (if the outside air temp is 65deg) then it will start working.