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360 A/C comp not clicking in

Discussion in '360/430' started by rizzo308, Jul 23, 2021.

  1. rizzo308

    rizzo308 Formula 3
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    Sep 12, 2004
    2,281
    Perth, Australia
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    riggio
    Hey guys
    My A/C sh#t it's self so i had it rebuilt i refitted it and tried to engage the comp as we were re-gassing it
    but the comp would not kick in. Fuse and relay behind the seat and main A/C fuse nxt to battery all good but still no power to the comp.
    Is there a mystery fuse some where else along the line. TIA
     
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  3. mike32

    mike32 F1 Rookie

    May 13, 2016
    3,645
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    Compressor clutch will not engage if not enough gas pressure, try a temporary link wire on the pressure switch mounted at the drier. This will get it running if that switch is not made due low gas pressure.
    If this does not work check for power at the connector at the compressor clutch
     
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  4. rizzo308

    rizzo308 Formula 3
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    Sep 12, 2004
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    riggio
  5. mike32

    mike32 F1 Rookie

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    #4 mike32, Jul 23, 2021
    Last edited: Jul 23, 2021
  6. 24000rpm

    24000rpm F1 Rookie

    test the pressure crudely by using a small screwdriver to press down the schrader valve(by the brake fluid reservior) a little bit to see if r134a is coming out. It should be having a big noise like you are deflating a tire. If you don't have enough pressure then your ac ecu won't give power to the compressor
     
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  8. rizzo308

    rizzo308 Formula 3
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    Sep 12, 2004
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    Yeah mate that plug is of Number 14 on the parts diagram you posted.
    Cheers
     
  9. Qavion

    Qavion F1 Veteran
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  10. rizzo308

    rizzo308 Formula 3
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    Sep 12, 2004
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    riggio
    Hi Ian
    So it’s blue and yellow.
    Cheers
     
  11. Qavion

    Qavion F1 Veteran
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    #9 Qavion, Jul 23, 2021
    Last edited: Jul 23, 2021
    According to the wiring diagrams, it's blue and orange/white on the middle wires.

    i.e. pin 2 and 5 (pin 1 is unused)

    Wiring diagram here

    https://www.dropbox.com/t/gnz3XSmL0grAyFrc

    i.e. item 21B

    If you remove the plug and jumper the wires, just be aware that this will inhibit the radiator fans.
     
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  13. rizzo308

    rizzo308 Formula 3
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    Sep 12, 2004
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    riggio
    I jumped the 2 wires on the pressure switch and glad to say that my comp is now engaging. Thanks to all you guys for your help much appreciated.
     
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  14. Qavion

    Qavion F1 Veteran
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    So either a faulty switch or low gas?
     
  15. TheMayor

    TheMayor Eight Time F1 World Champ
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    Feb 11, 2008
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    Running the compressor without gas is bad for the compressor, which is why that switch is there. So this needs to be determined.
     
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  16. mike32

    mike32 F1 Rookie

    May 13, 2016
    3,645
    Uk
    Best to get a gas charging set with the suction and discharge gauges on, that will give you the gas pressure in the system. When the compressor has been off for a while the 2 gauges will read the same. Once running the suct will drop and discharge rise. If you do not have enough gas in system then the pressure switch will operate to protect the compressor by stopping it. ( hence the need to link it out to get gas into system.)
     

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