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  •  » Have an A/C clutch coil question

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    8/29/2013 1:20 PM  #1

    retired 65
    I FYI 24-7

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    From: nixa, mo.
    Registered: 4/02/2013
    Posts: 336

    Have an A/C clutch coil question

    Can someone tell me how to best check a A/C clutch coil to see if it is good or not.  I have a Sanden A/C compressor on a 351W motor with serpentine set-up.  The clutch slips when A/C is turned on.  It squeals when turned on.  The clearance between the plate and pulley is .024.  I believe the spec is .015 to .030.  The ohms in wiring thru the coil is 3.7 ohms.  On another coil I have on a Sanden, it is 4.1 ohms.  I have good continuity to ground thru mounting of compressor to motor and I have 11 volts at the wire to the clutch when the A/C is turned on.  This is without the motor running.  The compressor is a SD-5, model EC-123PV61AE. Also, does anyone know if the coil for a v-grove pulley compressor is the same as a coil for a serpentine pulley compressor if it is for the same application?  I was told that a serpentine compressor clutch coil is thicker than one that comes with a v-groove pulley. My reason for asking is, I have another compressor with a double grove v-grove pulley if the one I am testing is indeed bad.  Thanks for the help.

    "when I drop something, it always goes to center of the car"
     

    8/29/2013 2:05 PM  #2

    wsinsle
    Senior 24-7 FYI Addict

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    From: Belle Vernon, PA
    Registered: 4/01/2013
    Posts: 1,664

    Re: Have an A/C clutch coil question

    When you ask about a pulley coil, I don't know about size. I would have to think a clutch on a V grove pulley system would have to hold just as tight as a clutch on a serpentine system to turn the same compressor. The clutch has to overcome the resistance of the compressor not the pulley system to make things work.

    If this forum can't fix it, it isn't broke.
     

    8/29/2013 8:19 PM  #3

    retired 65
    I FYI 24-7

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    From: nixa, mo.
    Registered: 4/02/2013
    Posts: 336

    Re: Have an A/C clutch coil question

    That's my thoughts also, but I thought I would ask.  Thanks for the input.

    "when I drop something, it always goes to center of the car"
       •Thread Starter
     

    8/30/2013 9:18 AM  #4

    Pablo
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    From: Georgetown, Texas
    Registered: 4/12/2013
    Posts: 248

    Re: Have an A/C clutch coil question

    Eleven volts sounds low.  At rest, the battery voltage should be about 12.5.  I would suspect that you have some corrosion in a connector to the compressor, or somewhere in that line.  To test, start the motor, turn on A/C, remove connector to compressor coil, run a jumper wire from that connection on the coil back to the battery.  I would use at least 14 ga. wire.  If it still squeals and slips, it's the clutch - most likely the coil.  If the jumper wire "cures" the problem, happy hunting - for the resistance in the original line.
    Good Luck
     

     

    8/30/2013 2:41 PM  #5

    Bullet Bob
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    From: Montrose, Colorado
    Registered: 4/01/2013
    Posts: 4,786

    Re: Have an A/C clutch coil question

    retired 65 wrote:

    It squeals when turned on.  .

    If it's squealing, it sounds like the  compressor might be locked.  If you put a wrench on the clutch hub nut can you turn the compressor by hand?

    BB

    "you get what you pay for, good work isn't cheap, and there are NO free lunches...PERIOD!"
     

     

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