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a/c compressor wil not kick on.

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Old 04-06-2010, 11:06 AM
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Default a/c compressor wil not kick on.

Compressor is not locked up. Relay is good. System is charged. Some help please.
Old 04-06-2010, 01:20 PM
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anybody?
Old 04-06-2010, 01:59 PM
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Well how did you check all of the above?
Old 04-06-2010, 02:23 PM
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Originally Posted by THE SHOP
Well how did you check all of the above?
cluch spins by hand, replaced relay, system charged by gauges
Old 04-06-2010, 02:28 PM
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Is it getting power? There is a plug on the top of the compressor behind the pulley. Mine wouldn't come on and that wire was broke
Old 04-06-2010, 02:37 PM
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Originally Posted by bigj2717
Is it getting power? There is a plug on the top of the compressor behind the pulley. Mine wouldn't come on and that wire was broke
I am in process of tracing wires now.
Old 04-06-2010, 02:38 PM
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Any other ideas? Would pressure switch do this?
Old 04-06-2010, 03:00 PM
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Pressure switch or low pressure will do it. Depending
on model year you may have a switch, or a sensor that
the PCM looks at and does the pressure-check function.

So will an unstable idle; suspect this if you can get A/C
to kick on at cruise, but get A/C cycling or surging at
idle.
Old 04-06-2010, 03:07 PM
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Originally Posted by jimmyblue
Pressure switch or low pressure will do it. Depending
on model year you may have a switch, or a sensor that
the PCM looks at and does the pressure-check function.

So will an unstable idle; suspect this if you can get A/C
to kick on at cruise, but get A/C cycling or surging at
idle.
Got good idle and it does not kick on at a cruise.
Old 04-06-2010, 04:21 PM
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Check for power at compressor
Old 04-06-2010, 04:33 PM
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Originally Posted by stburgpete
cluch spins by hand, replaced relay, system charged by gauges
Also did you spin the clutch or just the pulley? You can run a hot to the compressor to see if it engages that will verify it working.
Old 04-06-2010, 08:10 PM
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well the obvious is... Is there refrigerant in the system?? If there is not, the compressor wont turn on. Also the pressure switch may be bad. You can "jump" it, by unplugging the connector to the pressure switch. Then take a cotter pin and stick it in the harness to complete the circuit through the cotter pin, it should kick on, or at least the secondary fan will turn on, if it does not, you need a new pressure switch.
Old 04-06-2010, 09:23 PM
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Originally Posted by THE SHOP
Also did you spin the clutch or just the pulley? You can run a hot to the compressor to see if it engages that will verify it working.
belt spins the pully and my hand spins the clutch when engine is not running. Never ran a hot to the compressor can you make it more simple?
Old 04-06-2010, 09:25 PM
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Originally Posted by 98pontiac
well the obvious is... Is there refrigerant in the system?? If there is not, the compressor wont turn on. Also the pressure switch may be bad. You can "jump" it, by unplugging the connector to the pressure switch. Then take a cotter pin and stick it in the harness to complete the circuit through the cotter pin, it should kick on, or at least the secondary fan will turn on, if it does not, you need a new pressure switch.
As posted it is charged. How do I jump it just from one side of the plug to the other?
Old 04-07-2010, 09:34 AM
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Originally Posted by stburgpete
As posted it is charged. How do I jump it just from one side of the plug to the other?
You stick a wire from one side into the other is what he is saying, to check the compressor itself run a negative and positive wire off the battery and touch the contacts on the compressor itself it should kick on immediately
Old 04-07-2010, 11:19 AM
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Originally Posted by THE SHOP
You stick a wire from one side into the other is what he is saying, to check the compressor itself run a negative and positive wire off the battery and touch the contacts on the compressor itself it should kick on immediately
Thanks going to do this now.
Old 04-07-2010, 02:18 PM
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ok 94 Z28 has no presure switch but it has a sensor how would i test it and will it stop the clutch from kicking on? Tree wires.
Old 04-07-2010, 02:24 PM
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the compressor wires which is pos. and which is neg.?
Old 04-07-2010, 02:36 PM
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Originally Posted by stburgpete
ok 94 Z28 has no presure switch but it has a sensor how would i test it and will it stop the clutch from kicking on? Tree wires.
Yeah if pressure is under 38 psi or over 414 the compressor will not operate So it does have the switch lol
Old 04-07-2010, 02:45 PM
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Originally Posted by THE SHOP
Yeah if pressure is under 38 psi or over 414 the compressor will not operate So it does have the switch lol
ok if there is one were is it there are only two wires that go to the compressor and that is power. autozone repair guide shows the switch on the back side of the compressor on a 3.3L engine not 5.7L. I also look at a new compressor for my car and it has no place for one on the back side of it.?????????????????



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