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Turns out it was the ignition switch: $541 out the door :(

Now that my A/C is working, I have another issue! While driving, my Tahoe has momentary power cutouts where the car stalls, radio goes off and clock resets. Sometimes it is a very quick cutout where the car almost stalls (I can tell because the power steering temporarily fails) other times it...

It turns out the Schrader valve was leaking so it was in fact low on refrigerant. I did take it to a shop and they ended up having to replace the complete hose assembly. Thanks for all your guidance. -Steve

I have a '99 Tahoe and the A/C compressor is not engaging. I have been reading the threads here and have done the following: 1. Checked the low pressure input and it reads about 30 psi 2. Jumped the wires connected to the low pressure switch and the A/C engages but the air is still hot...