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Pontiac Forum: 2008 G5 ac compressor question
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  #1  
Old November 25th, 2016, 08:51 PM
orbit398 orbit398 is offline
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2008 G5 ac compressor question

Bought a nice car but the AC compressor was bad per PO. Had reliable shop check it out and they said compressor had power to it but it was bad.

So I replaced it. Pulled a vacuum and then attached a can of 134a to pressurize it a bit to overcome the low pressure limit switch.

Well the compress still doesn't come on. I have checked the fuse in the box under the hood, and they are ok.

Any suggestions? Can I run 2v DC power directly to the compressor connection to engage the clutch? I see a red and black wire at the connection and wonder if can just put power to it.

thanks for helping.
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Old November 26th, 2016, 10:34 AM
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melsg5 melsg5 is offline
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use a voltmeter or test light to see if you have power
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Old November 26th, 2016, 06:01 PM
orbit398 orbit398 is offline
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no power to connector at compressor. The clutch does work as I powered it directly and I can hear it engage.
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Old November 26th, 2016, 09:45 PM
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so how did the shop get power to the compressor?
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Old November 28th, 2016, 05:07 AM
Zimgxp Zimgxp is offline
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You could try and jumper the pressure switch.
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Old December 1st, 2016, 03:24 PM
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Not sure how to jump the pressure switch as it is a three wire switch. Details are at this website:

http://workshop-manuals.com/pontiac/...ns/page_14286/

I have checked two relays and any fuse associated with the HVAC. One relay in the car and and one under the odd. All are functioning correctly.

Not sure how the shop tested the compressor but they did say the clutch was bad. I have confirmed the clutch on the original compress was bad so I got a replacement compressor.

Not sure what to do next.

Another question I have is when I do push in the AC button on the dash, the fan does not come on either. I assumed that it should come on also once the button was pushed. Is this how this car operates? Thanks for any help/suggestions.
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Old December 3rd, 2016, 02:18 PM
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Fixed

Want to let folks know that the all was well on the car. I checked and replaced everything I could: Compressor (twice), pressure sensor, condenser/dryer, expansion valve etc.... Turns out it was the gauge set I borrowed from Autozone. The connections never screwed in far enough to push in the shrader valves. Attaching a can to the system to hopefully over ride the pressure switch didn't work. Even though the gauge showed approx 100 psi, I could never get the low side to move, thus thought I had a bad compressor. Not the case. 3 days of time wasting and searching for the issue really was a drag.

Lastly, I thought something was up with the gauges; took to a friends shop and bingo. Filled system in 5 mins and it works great.

Learning experience.
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Old December 3rd, 2016, 04:55 PM
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great to hear you got it resolved
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