Compressors not turning on
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  1. #1
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    Default Compressors not turning on

    I have an issue that my compressor were working, but I decided to turn off the truck so they wouldn’t be hot, so they can cool down since my tank was empty. Next day I go and they didn’t turn on, witch I have the compressors to turn on with the switch key of the truck. I thought it might be the relays so I ordered some and still nothing any ideas? Thanks

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  3. #2
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    The only way to troubleshoot a capacitor is by replacing it and testing the unit, so this is commonly done when an AC compressor won't turn on. ... Valves Ė A broken valve can create major problems in a compressor. The most common issue is that the refrigerant is liquid instead of gas when it gets to the compressor inlet.
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  4. #3
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    Bypass everything and put power directly to the compressor power wire. If they kick on, itís either the relay or the pressure switch. Relays are easier the replace so Iíd start there.

  5. #4
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    I replaced the pressure switch and relay, still nothing and also tap the compressor and it did kick on but when it’s with the truck nothing. Can it be the wires? They been there for years

  6. #5
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    Did you wire the comps directly a battery ?

  7. #6
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    Yes I did and both of them turn on

  8. #7
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    Sounds like a wiring issue between the comps and the battery. Sorry dude, your just going to have to invest some time or requiring it all.

  9. #8
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    Yeah I figured, already ran a dummy wire from the pressure switch and relay and that’s all good. Now I’m going to test the wire to the battery, thanks for the help and info homie

  10. #9
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    And it’s also good to add a toggle to the relay Incase the p/s craps out and the comp won’t turn off. At least you could.

  11. #10
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    Ok I tested all the wires from the battery and compressors and pressure switch and the work. Have a question on one from the relay, they put together the one going to ignition switch and ground, of the 4 wires the 2 blue I get signal the 2 yellow nothing, should one be grounded to the truck?

  12. #11
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    Ok Checked the yellow wire that one is going to the positive to the battery the one that should be ground is going to the switch of the truck, so everything is getting connection, so the only thing I would guess is the plug going to the relay, I did see some were kind of melting together so I’m thinking replacing those.

  13. #12
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    If itís melted, Iíd start there for sure. I donít know the numbers on the relay but I know itís like a cross, for lack of a better term. You have your power circuit and your switch circuit. So your power runs through the relay. Power in, power out. On the switch circuit itís a triggered switch. So from what ever ignition circuit your pull from, through the relay and then out of the relay to ground.

  14. #13
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    Appreciate all the help homie

  15. #14
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    No problem. Iím not guru. But just figured I could throw a little knowledge at you.

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