AC clutch smoking

Discussion in 'Gen 1 & 2 - Engine, Exhaust, Drive Line & AC syste' started by goryr88, Sep 16, 2020.

  1. goryr88

    goryr88 SHO Member

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    93 MTX. When I have the ac or HVAC. on at all, the clutch starts throwing smoke off after a few minutes. Turn the HVAC off, and it quits. What's up with the ac? I've never seen this before. I'm guessing it's shot and needs replaced. Anybody else have this happen?
     
  2. yaycandy

    yaycandy Cleetus Mac

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    Just old. Time to hopefully just replace the clutch pulley or in most cases an AC rebuild. They seize up from not being used, if an AC compressor is ran daily it would last a very long time.
     
  3. Irish Pride

    Irish Pride Irish Inside Staff Member Super Moderators

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    The coil is probably on the way out. Does the compressor still work when on? Make any weird noises?

    -Chad
     
  4. NoSlo

    NoSlo GoldMember

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    Slipping clutch. Need to clean the surfaces of the pulley, and re-shim to specification.
     
    SHOMON likes this.
  5. goryr88

    goryr88 SHO Member

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    It works fine. No funny noises. Just smoking like something is burning up.
     
  6. Irish Pride

    Irish Pride Irish Inside Staff Member Super Moderators

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    Look at it while it's engaged and running and verify that the clutch isn't slipping like suggested above. If it's grabbing good then my guess is the Coil.
     
  7. jman1200

    jman1200 SHO Member

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    If it is slipping is because:
    - The load has increased => possible that compressor is going bad
    - The clutch clearance has increased due to wear => might be possible to remove a shim and adjust the clearance but it might be burnt by now, so replace the clutch/pulley

    Now, are you sure the clutch is slipping? I once had a pulley bearing go bad on a Mazda 626, it overheated to the point that the magnet/coil's resin melted creating a lot of smoke.

    I do not know if the magnet/coil can be "weak", IMO it either works or not.
     
  8. tompumped

    tompumped SHO Member

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    I never realized the 10p15f compressor has a rubber bonded clutch. The car I finally started working on the rubber was melted and no longer holding. If the clutch is slipping it would cause it to melt the rubber.

    I also had a nissan that ran out of oil and started burning the oil coating the outside of the compressor because it was overheating.
     

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