AC compressor clutch not coming on - Truck Forums


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Old 09-10-2010, 10:26 AM
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Default AC compressor clutch not coming on

1991 Silverado k1500.

The blower works fine to bring in outside air, but when I press the AC button the compressor clutch does not engage.

  • The AC fuse located inside the cab near the driver is okay
I jumpered the low pressure cut-off switch on the accumulator: but still the clutch does not engage

What's the next thing to look at?

- 80skeys
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Old 09-10-2010, 11:13 AM
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Check the wire for power going to the A/C to see if it is gettin a signal.
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Old 09-10-2010, 12:43 PM
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It sounds like if you have power, just remove it and take it to autozone and have them test it.
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Old 09-10-2010, 03:24 PM
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Quote:
Originally Posted by RUFFNECK4LYFE View Post
Check the wire for power going to the A/C to see if it is gettin a signal.
I checked it. No juice.
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Old 09-10-2010, 11:30 PM
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Now that I know there's no power to the compressor, where do I look next?
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Old 09-10-2010, 11:31 PM
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Ok next locate the relay for it. Most systems have a fuse and a relay for the A/C. Only way for a quick check is to replace it wit a new one.
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Old 09-11-2010, 08:23 AM
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Also check to see if there is power to one side of the low pressure switch.
I have replaced quite a few of those control heads too. Usually they will flash when there is an issue.
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Old 09-11-2010, 10:15 AM
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There is no power to the low pressure switch. The control head is not flashing.

I have no idea where the relay is on this truck. Anybody know?
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Old 09-11-2010, 01:20 PM
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I think its behind your glove compartment.
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Old 09-28-2010, 02:07 PM
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It looks like there are three identical relays in a row from left to right, behind the glove compartment. None of them are labeled as to their function. Anyone know which one is for the A/C?
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1500, 1992, 1997, 2500, ac, chevy, clutch, coming, compressor, engage, gmc, honda, power, ridgeline, silverado, yukon

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