Question about 2003 GMC Envoy
This should be done by A/C certified mechanic. You will have to buy the guages, the freon cans and connect it to the high and low pressure attachments. Red is high and yellow is low.. The older systems just have a valve that looks like a tire valve.
Posted on Jul 01, 2009
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Posted on Jan 02, 2017
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Single Pressure Gauges for Indl., Commercial & Specialty Uses
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