Question about 1998 GMC Sierra

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1998 GMC C3500. The AC compressor clutch won't engage. Checked the refrigerant pressure, 40psi @ 77˚. Checked the fuse in the box on the side of the dash as well as under the hood. Checked the AC Relay (switched it with the starter relay). No power to the electrical connection at the clutch.

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Your low on freon.

Posted on Sep 05, 2010

  • Donnie Wilson
    Donnie Wilson Sep 05, 2010

    If the system was full your static preasure should be close to your ambeint tem

  • JustRead Oct 06, 2010

    Hey idiot he said he checked the "refrigerant" I know that's a big word compared to freon for your redneck culture...how about you give us a little insight instead of just trying to get thousands of posts. I have the same problem and my "refrigerant" is topped off. No leaks, used a sniffer. Swapped relays and fuses. Same problem. Thanks for your "word" of "wisdom" wilsodfarm. BTW "your" means possession as in "your car". Proper terminology would be "you're". As in a contraction for "you are". Wow how did you figure out how to use a computer.

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Justread is a ***********

Posted on Jul 04, 2012

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1 Answer

Ac not working, air compressor clutch not engaging


Hi Adeyeri

Keep in mind that the Clutch won't engage for a few safety reasons.

Temperature inside vehicle
Temperature of compressor or pipes
Pressure inside pipes
Compressor jambed
Eg It's out of refrigerant Gas

You can momentarily engage the clutch by simply giving it +12v to the wire attached to clutch. Usually has a connector close by.
Or
If it has a Relay (click) in fuse box
You can by pass it with a jumper

A quick engage & disengage should allow you to detect possible problem.
But don't over ride the built in safety for more than about a minute.

Cheers
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there is no relay in that box that is called the tipm or totally integrated power module. that module is controlled by a computer and should be checked with a scanner to see if you have a code for the a/c. i m having the same problem i have been told it could be low freon but can not get the clutch to engage to check the high and low pressure. Also read where it may be the diode in the clutch on the ac compressor if you have a multimeter probe the compressor a good compressor will read somewhere between 3.5 and 4.0 anything else and clutch needs to be replaced. other possibilities may be the high or low pressure switch on the line. on myh 2006 2500 diesel it is located near the plug for the compressor on bottom side of motor. hope this helps.

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