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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: sscobra on June 30, 2010, 12:26:34 am
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I have an 86 C10. I recently decided to try an get the a/c working. However, there's a problem. When the ac is turned on, the compressor kicks on. Great, right? Well, here's the problem. When I disconnect the low pressure connector from the switch the compressor keeps running. I did rebuild the a/c compressor harness(factory one was shot) coming from the firewall connector to the compressor. I thought I built the harness identical to the factory one. So does anyone know where I can find an a/c wiring diagram. I checked the diagrams on this site(which are the same ones from my haynes manual) and they show nothing about the a/c wiring. Any ideas? Your help is appreciated.
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that wire should be a green wire. You can take a volmeter and check for a closed circuit after you unplug the plastic switch connector.
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Thanks for the response. The black connector coming from the firewall harness has 2 leads with 3 wires. One lead has 2 wires going to the back of the connector(they are green). This is the lead that I get power to when I turn the a/c switch on inside. I'm not sure what the other lead is for in that connector, as I wasn't able to get power to that lead. Also, I am getting "switched" on/off power to the low pressure switch(should mean the wiring there is fine). The new harness has a single wire that goes from the 2lead/2wire green wire black connector to one lead on the compressor and the other lead on the compressor goes to a ground on the bracket. I was pretty sure this is the way factory harness was done? Thanks for any help.
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(http://i6.photobucket.com/albums/y228/Sabaka454/acwiring.gif)
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Click Here for the full size (http://i6.photobucket.com/albums/y228/Sabaka454/acwiring.gif)
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Thank you sir! That's great. So are does the dark green wire and the black ground wire combine at the compressor or am I looking at it wrong? Thanks again for the help.
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They do not combine. Not sure if it is drawn that way to represnt a loom or to save on drafting man-hours.
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Thanks for all the help. I figured it out. I was rushed when I finished the harness. I had connected the compressor harness to the idle soleniod side of the connector. Switched the wires around and I was getting power where and when(ie: only when the pressure switch was engaged) I need it. Also, does anyone know where the orfice tube is located on these trucks? Thanks again for all the help.
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In the dimpled line right before the evaporator (after the nut)
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I've got A/C!! ;D Now I feel really good about my $650 purchase. It's nice to be able to take my son with me now when we need to take the truck. Thanks again to everyone for all the help!