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Thread: FN2 Air con fault! Help please

  1. #1
    LGT19's Avatar
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    Default FN2 Air con fault! Help please

    Hi guys,

    Been having some trouble getting my air con to work in the recent hot weather. I never tried it when I bought the car during the winter and only noticed it wasn't working the other week when we had the scorching heat.

    I've done some googling, watched YouTube vids and spoke to a few AC people but I still can't find the issue.

    Control unit inside works - AC toggles on and off in the screen when the button is pressed.
    New relay under the bonnet (seen they are usually a culprit)
    Fuse replaced under the bonnet no.7
    Fuse replaced inside the car no.36
    Had the system pressure tested and re-gassed


    I can't hear the relay clicking when the button is pressed but there definitely power in the socket. The fan or clutched pulley doesn't engage either.

    Anybody else got anything I can try before I hand my car and wallet over to a specialist? I saw somewhere that the FN2 might have a small separate unit (like a little ecu) that controls the air con but I wasn't convinced.

    Any help would be greatly appreciated!!

  2. #2
    dweezle's Avatar
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    Honda's diagnosis sheet (possibly US)

    http://www.pontiacpower.org/pdf/ACtestUS.pdf
    Last edited by dweezle; 13-08-2019 at 06:43 PM.

  3. #3
    LGT19's Avatar
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    Thanks for this dweezle!

    Matching what I'm seeing I think the bottom fault is most fitting of my current issue. I've checked the terminals already and traced the wiring which all seems fine and dandy to me. Powertrain DTC's in interesting though - I'll have to plug my OBD2 reader in and see if there's held on the ECU (although I removed this possibility early on).

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    dweezle (14-08-2019)

  5. #4
    LGT19's Avatar
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    Update on this issue - checked the ECU for any logged issues and there was nothing held. The only thing I can think of now is the pressure sensor in the high pressure side of the air con piping behind the drivers side headlight. I'm off to the scrappies on Saturday to pick up a couple of other things so I'll see if I can grab a pressure switch and swap it out.

    If not, I might have to get Honda involved and prepare to re-mortgage my house

  6. #5
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    Sorry for the late reply but reading it most probably is the clutch of the a/c compressor.

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