How do I identify the low pressure port ? Any other tips would be greatly appreciated. The a/c works, it's just getting weak. It has probably been 6-7 years since it was serviced last.
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1993 Chevrolet G Series Van (G20) Question: How to add R134a to my van
Answer #1hemicuda May 30, 2009, 11:41Master
If your using a can of refrigerant from a auto parts store the fitting is designed to only fit the low pressure port, be careful not to overfill.
Replyronsoftail, May 30, 2009, 13:14Enthusiast
The auto store recharge kit did not fit the nipple with black cap. There is another one sticking out of the evaporator ??? canister that has no cap. Totally uncovered. Might that be it ???
Replyhemicuda, May 30, 2009, 15:38Master
here's a site that has instructions for recharging your system http://www.ehow.com/how_2081698_add-freon-car-air-conditi... the fitting on the can only fits the low port