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no power to ac compressor

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Old Jul 1, 2012 | 10:53 PM
  #1  
77chevymonster's Avatar
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Car: 1987 IROC Z
Engine: 305 TPI
Transmission: 700R4
no power to ac compressor

I recently got an 87 camaro iroc z with a 305 in it, but it had been sitting since 95 and had a small problem with rats. They chewed up a lot of the wiring, but i think i got all if not most of the wires fixed. however when i try to get the ac working, the clutch will not engage. I used a test light to see if there was power getting to the clutch, no. But when i wire the Black and green wire terminals to a battery, the clutch will engage... i need help tracing the wires back through everything
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Old Jul 2, 2012 | 06:21 AM
  #2  
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From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: no power to ac compressor

Originally Posted by 77chevymonster
i need help tracing the wires back through everything
Welcome to TGO, 77. Perhaps the following will be useful:

http://www.austinthirdgen.org/index.php?pid=19

JamesC
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Old Jul 2, 2012 | 08:26 PM
  #3  
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Car: 1987 IROC Z
Engine: 305 TPI
Transmission: 700R4
Re: no power to ac compressor

thanks yeah it helps a lot
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Old Jul 2, 2012 | 08:31 PM
  #4  
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From: Huntsville, AL
Car: 89 Black IROC-Z convertible
Engine: 305 TBI
Transmission: Auto
Re: no power to ac compressor

You may want to try to jumper the low pressure switch connector to see if the compressor kicks in. Don't run it that way unless you are charging it but its an easy way to see if the compressor runs.
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Old Jul 2, 2012 | 08:35 PM
  #5  
77chevymonster's Avatar
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Car: 1987 IROC Z
Engine: 305 TPI
Transmission: 700R4
Re: no power to ac compressor

yeah i did that and it acted like it would engage...didnt have the motor running, but the unit itself seems pretty solid...just an issue somewhere getting power directly to the compressor
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Old Jul 3, 2012 | 09:36 AM
  #6  
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From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Air Apparent

Using a voltmeter or test light (the type for testing for voltage, not a continuity tester) probe the light green wire on the pressure cycling switch.

Is there power there when the key is in the RUN position and the AC controls are set to AC?


Happy Racing!



My Brakes Don’t Work AT ALL When The Car Is In The Air

.

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Old Jul 3, 2012 | 06:11 PM
  #7  
77chevymonster's Avatar
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Car: 1987 IROC Z
Engine: 305 TPI
Transmission: 700R4
Re: no power to ac compressor

yeah i have a voltage tester, if there is power to the pressure switch, will the compressor be stopped from engaging due to a lack of freon?
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Old Jul 3, 2012 | 10:58 PM
  #8  
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Car: 1987 IROC Z
Engine: 305 TPI
Transmission: 700R4
Re: no power to ac compressor

just messed with it a little, no power to the clutch, none to the ac cutoff switch, and none to the two terminals at the top of the condenser, also no blown fuses
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Old Jul 3, 2012 | 11:08 PM
  #9  
77chevymonster's Avatar
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Car: 1987 IROC Z
Engine: 305 TPI
Transmission: 700R4
Re: no power to ac compressor

actually the accumulator not the condenser
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Old Jul 5, 2012 | 09:10 AM
  #10  
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From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Air Apparent

In post #5 you implied you heard the comp clutch click.

That’s consistent with power on the low pressure switch.


Originally Posted by 77chevymonster
if there is power to the pressure switch, will the compressor be stopped from engaging due to a lack of freon?
Not if the rest of the system is good.


Originally Posted by 77chevymonster
just messed with it a little, no power to the clutch, none to the ac cutoff switch, and none to the two terminals at the top of the (accumulator)……
Sounds like you pulled a wire after post #5.

Pull the HVAC panel enuff to probe
light green wire with the key in the RUN position, and the control in the AC on mode.

Is there power there?


Happy Racing!



Spin Me This Week . . . I’ll Spin You Next Week

.

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Old Jul 5, 2012 | 07:11 PM
  #11  
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Car: 1987 IROC Z
Engine: 305 TPI
Transmission: 700R4
Re: no power to ac compressor

yeah it works now had to reconnect the wire, rats chewed through it thanks for all the help
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Old Jul 6, 2012 | 04:39 PM
  #12  
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Car: '91 Z28 convertible
Engine: TPI
Transmission: T5
Axle/Gears: 3.27 posi disc
Re: no power to ac compressor

Thanks for posting back the follow up, it always helps.

And thanks to NINA, of course, for his great help, as always.
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Old Jan 20, 2013 | 03:47 PM
  #13  
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From: Austin, Texas
Car: 91 Camaro R/S
Engine: Tbi 350
Transmission: auto4
Axle/Gears: Stock
Re: no power to ac compressor

I'm having the same problem with my 1988 v6 Camaro, the only way I can get my ac compressor to turn on is if I have hooked to a toggle switch, there is no power going through either of the plug wires that clip into the compressor. The fuse is good as well. Where else should I look for a problem at?
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Old Jan 28, 2013 | 04:37 PM
  #14  
NINÅ's Avatar
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From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Air Apparent

Originally Posted by curtalert89
there is no power going through either of the plug wires that clip into the compressor
Using a voltmeter or test light (the type for testing for voltage, not a continuity tester) probe the light green wire on the pressure cycling switch. located on the accumulator (the silver can on the firewall).

Is there power there when the key is in the RUN position and the AC controls are set to AC?


Happy Racing!



If We Don’t Get Cawt We Ain’t Cheatin

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Old Jan 28, 2013 | 06:03 PM
  #15  
curtalert89's Avatar
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From: Austin, Texas
Car: 91 Camaro R/S
Engine: Tbi 350
Transmission: auto4
Axle/Gears: Stock
Re: no power to ac compressor

Yes there is, I'm thinking it may be the relay, because I disconnected it and switches it with the other and when I do that my car won't start, but when I switch it back it starts up!
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Old May 20, 2015 | 07:42 PM
  #16  
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Re: no power to ac compressor

Everything was working, but my AC was howling, so I contacted Oreileys. My warranty ran out two days ago. The manager said don't worry. So I took the old compressor off and an extra plug wasn't on the new compressor. Oreileys said to fill the system, it should be fine. It didn't work. Til I took a metal staple and closed the circuit. Cold air and everything. Then the metal started arcking. I quickly undid it. Now all wires are correctly hooked up, but the fan inside the car doesn't work at all. I can't make the compressor come on so I can refill the system. Is there a fuse I can't find? Shouldn't be the relay, the fan will work on lower speeds if the relay is bad.
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