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1995 GMC Sonoma Hi Side Service Port

magicsound on Mon June 23, 2014 10:52 PM User is offline

The hi side service port has a R134 QC fitting with a built-in check valve, not a schrader type. It mounts to the hard line with a 1/2 inch male Acme thread. I can't seem to find a replacement part - is this a "one-off" unique to this vehicle, or am I missing something?

Because 1995 was a transition year from R12 to R134, I'm starting to suspect GM made a unique part to put a R134 service coupling onto a R12 pipe they already had from the previous model year. The original part is leaking badly and needs replacing.

GM Tech on Tue June 24, 2014 7:43 AM User is offline

The valve is replaceable and sold by this site's sponsor- just click on a/c kits link above

a good cap with a rubber element will seal the leaky valve---believe it or not it works all valves leak a given amount- that is how I test my sniffer

1994 was the transition model year for S/T platform trucks

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

magicsound on Wed June 25, 2014 12:23 PM User is offline

Thanks for the clarification on GM transition to 134a. I was able to find the valve part locally, listed as a Ford component. Now I can pump out and recharge the system with some confidence.

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