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Thread: What are these connections please...

  1. #1
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    What are these connections please...

    The first is found under my passenger side manifold area...
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  2. #2
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    The second is to the right of the brake fluid reservoir under the cowl...
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  3. #3
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    This is obviously my AC unit...I was told that I am missing something from the AC by someone who saw a picture a while back....so two questions really...
    1) whats that thing the arrow points to?
    2) anything obvious missing here?
    Thanks, Tom
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  4. #4
    Well I dont know what the first 2 things connect to. But that thing on the back of your AC compressor is the popoff valve.
    If you get too much freon or the system goes down causing abnormaly high pressures that popoff valve will open and vent freon until the pressure drops to a safe level.
    I dont really see anything missing.

    What year SC is it?

  5. #5
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    its a 90 AOD. Someone said "Wheres your clutch?" But my understanding is that the clutch is the wheel that the belt goes onto?! Anyway, the AC doesn't work, and though maybe there was some big ol' thing that was a miss there.

  6. #6
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    The second one looks like the plug-in for the hood light.

  7. #7
    Yeah the clutch is in the pulley. I see the wires plugged into the clutch so its there.
    Does the center peice of the pulley turn with the pulley when you turn on the AC?

  8. #8
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    Hmmmm.... I dunno, I'l have to check that.

  9. #9
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    the first pic is a plug for the block heater, you may not have one in the block thus that is why the connector is not used. Not all motors came with block heateres, usually only the northern cars did due to cold winters.

  10. #10
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    Hmmm

    My understanding was that my block heater was the cord that looks like a normal 3 pronged plug......
    Whats this.......?
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  11. #11
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    that 3 prong plug is for the block heater, the red?? plug in the first picture is the part that connects to a frost plug on the block (disconnected). The pic by the brake reservoir area is a connector for the "boost solenoid" or something available only on 89 SCs I believe. So your car is fine

  12. #12
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    wuss a "frost plug"?

  13. #13
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    It's a part that replaces a freeze plug in the block. It has a heater coil attached that goes down inside the water jacket of the block.

    As far as the AC, if you turn it on and the clutch doesn't engage it could just mean the coolant leaked out of the system. The pressure switch won't allow the clutch to run with an empty system.

    The part of the AC you showed in the pic. On my 90 there's a bent piece of metal over the hole. All it does though is keep the crap from shooting straight out and hitting someone.

  14. #14
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    As far as the AC, if you turn it on and the clutch doesn't engage it could just mean the coolant leaked out of the system. The pressure switch won't allow the clutch to run with an empty system.
    Thats helpful to know. So if thats the case, do you refill/recharge?
    All it does though is keep the crap from shooting straight out and hitting someone
    LOL

  15. #15
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    Originally posted by NorthrnSCownr
    wuss a "frost plug"?
    frost plug = block heater, that part that goes in the block and heats up

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