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AC compressor

AC compressor

Postby Peter2500 [OP] » Sep 11 2019, 3:22am

So I have a 2005 GMC 2500hd that the ac decided to quit. I checked all the fuses and they are all good. Found that if I put a jumper in the relay spot the compressor kicks on no issue and system blows cold. When I had it jumped my buddy put his gauge on it it was showing in the green.

Put a new relay in just to be sure with no results. Then I put a jumper on the low pressure switch harness. Still no dice. Took the high pressure switch off the harness as I understand it is a N.O switch. Still nothing. I'm thinking I'm looking at the climate control panel in the truck? is there a way to check that it is calling the relay to fire? Any help would be great. I'm trying to avoid just throwing money at the problem.
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Re: AC compressor

Postby Walkers » Sep 11 2019, 5:48pm

You are pushing the button for the compressor right? Does the light illuminate? Is the fan on?
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Re: AC compressor

Postby Peter2500 [OP] » Sep 11 2019, 6:12pm

Light is on and the fan is running.
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Re: AC compressor

Postby Walkers » Sep 11 2019, 10:01pm

Unfortunately you will likely need to put a multimeter lead on the neg batt post, then start at the compressor and hopscotch back until you find the voltage. Unless the computer switches the negative side, then it is just the reverse. I havent ever had to do one of those, so not sure. You could also use a tow way scanner to test the component function.
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Re: AC compressor

Postby Walkers » Sep 11 2019, 10:01pm

I assume you have checked the fuses.
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Re: AC compressor

Postby Peter2500 [OP] » Sep 11 2019, 10:25pm

Sure did. All the fuses are good also replaced the relay just to be sure. I am curious if there is a way that I can check with the voltmeter at the relay to see if it should be triggering or not? It’s confusing me a little bit because if I remove the relay and put a jumper across it will run with no issues blows cold.
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Re: AC compressor

Postby Peter2500 [OP] » Sep 11 2019, 10:30pm

My other question is on the high pressure sensor side. I have read in some places that you can simply unplug it to bypass it. Not sure if there is any truth to that.
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Re: AC compressor

Postby Walkers » Sep 12 2019, 2:16pm

Google the diagram for the relay you are using. Should look something like this.

https://www.delcity.net/documents/autom ... iagram.jsp
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