A/C switch

Discussion in 'Troubleshooting & Diagnosis' started by GPN, Sep 8, 2017.

  1. GPN

    GPN Veteran Member

    Oct 5, 2016
    so i added a couple cans of R12 and my AC comes out real cold--what a treat. But, I am having the same issue---sometimes I have to move the lever from off position to on several times before it kicks on......1979 Z28
  2. Joekool

    Joekool Veteran Member

    Feb 4, 2002
    Hollister CA USA
    The simplest thing is to check for power at the clutch coil when you turn the AC on. If there is power you could have a poor ground or a failing clutch coil. If there is no power then you need to check for power to the cycling switch and then power leaving the switch.

    If there is no power out the cycling switch then you need to access the switch inside the control head and test there for proper power.

    Usually clutch coils either work or they don't, so it is rare to see one do what you're experiencing. The cycling switch is a common failure and very easy to replacing. The control switch is also a common failure and I believe available from classic car warehouses online.

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