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A\C Compressor Clutch Not Engaging

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Old 02-13-2018, 04:29 PM   #1
ALANJF
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Default A\C Compressor Clutch Not Engaging

I just picked up a 1992 corvette. The compressor clutch is not pulling in, the static pressure is sitting at 100 psig, with 134a in the system. I jumped the low pressure switch and the clutch did not engage, if i unplug the compressor what should be the voltage at the plug feeding the compressor
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Old 02-13-2018, 04:46 PM   #2
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System voltage, no less.
If you have say 14 volts across the battery while the engine is running then you should have basically the exact same thing at the clutch connector.
I would caution you about using a voltmeter on this though.
Use a test light if you have one.
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Old 02-13-2018, 05:08 PM   #3
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Originally Posted by PatternDayTrader View Post
System voltage, no less.
If you have say 14 volts across the battery while the engine is running then you should have basically the exact same thing at the clutch connector.
I would caution you about using a voltmeter on this though.
Use a test light if you have one.
Why not a voltmeter, load?

Last edited by JimLentz; 02-13-2018 at 05:08 PM.
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Old 02-13-2018, 05:15 PM   #4
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Originally Posted by JimLentz View Post
Why not a voltmeter, load?
Yep ...

Voltmeter is too sensitive. Need to load the circuit at least a little bit.
Ideally you would use a test light that had a bulb the size of a headlight lol ...

Last edited by PatternDayTrader; 02-13-2018 at 05:16 PM.
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Old 02-13-2018, 05:34 PM   #5
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Thank you Iíll try that if I have voltage at the compressor plug it must be the clutch
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Old 02-13-2018, 05:41 PM   #6
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Thank you I’ll try that if I have voltage at the compressor plug it must be the clutch
Its not enough to think of it that way. You can have voltage there but you need amperage there also. The ac compressor clutch circuit is sort of unique in this respect. Cooling fans and the blower motor circuit's are similar but to a lesser extent.
I guess don't over think it to much though; if it lights a test light up nice and bright then nine times out of ten you have a valid test.

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Old 02-13-2018, 05:43 PM   #7
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Yeah Iíll take it 1 step at a time
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