Question about 1994 GMC Safari

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A/C Compressor Question

I'm trying to recharge the ac on my 1994 GMC Safari. I need to turn the compressor on to be able to charge. Where is the compressor relay located? I've done the same thing on my 1999 GMC Sonoma and it worked fine (the relay was easy to find).

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Try grounding the LOW PRESSURE A/C SWITCH by the compressor, while trying to recharge. This will energize the compressor. Hope this helps.

Posted on May 08, 2009


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If you can locate the compressor under the hood, have someone turn the AC off and on while you watch the front of the compressor; this is where the clutch is located, and see if the clutch is engaging.
If it is, you should see a stationary part of it instantly click on and the belt on the idler should now be turning the formerly stationary part behind it.
It may take a couple of tries before you see what action is taking place.

If it is engaging and releasing, I would encourage you to locate an honest shop and have them check for system pressure. You may just have a low coolant condition easily solved.

If it is too far down, they should check for leaks after charging the system again.
This takes a special detector.

If you want to wing it and try it yourself first, you can buy a recharging kit with a gauge for ~$20 US that will include instructions on where to connect it to the system and what pressure is correct. The pressure is somewhat dependent on ambient temperature.

The coolant is available in two forms; one has a lubricant and some protective chemicals that are injected with the coolant (via the kit) and the other is straight coolant.
With your vehicle having 14 years of service, I would first use the complete refrigerant with additives.

DON'T exceed the recommended pressure since this can cause damage to the system or a constant cycling of clutch due to overpressure.

Jul 03, 2008 | 1994 GMC Safari

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