Thank you all for the input. Finally got back from out of town and had time to investigate and fix. Turns out I was so low on coolant that my compressor wouldn't stay on. Had to jump the sensor with a piece of wire to keep the compressor running and dump in a bottle of coolant. After a few days...
I have a 2007 Tahoe LTZ. And recently the A/C, especially on hot days (90 deg) will never get cold.
A/C is on Max. set to 60 deg and turned all the way up.
I purchased a coolant fill bottle, and when I attach it to the fill port, the pressure ranges from 25 (compressor off?) to roughly 65psi...
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