Air Conditioning problem
2000 Cadillac Escalade V8 Four Wheel Drive Automatic
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all i need to know is where is the low side valve.i noticed one of the valves has a blue mark along the side. is this it?

yes it is. high side is a red cap blue is low side. do yourself a favor and dont add any leak sealer. if you have any other questions just let us know and thanks for the donation.