Question about 2001 Mercury Grand Marquis

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A/C compressor/pulley clutch does not disengage.

My compresssor clutch on my 2001 Grand Marquis does not disengage, causing icing under the hood and eventually low air flow from the vents.
If I unplug the wires from the compressor the clutch disengages, so I don't believe it's the clutch.
Is this a relay problem? Thermostat?
Thank You in advance for any help on this.

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  • Randy Wilson
    Randy Wilson May 21, 2009

    I'm going to try that. I had to oder one. It won't be here until Friday. I'll post the results. Thanks

  • Randy Wilson
    Randy Wilson May 23, 2009

    Nope, it was not the cycling switch. I'm thinking clutch cutoff relay. What do you think?

  • Randy Wilson
    Randy Wilson May 24, 2009

    I replaced the A/C Cutoff Relay and fixed the problem.

  • Randy Wilson
    Randy Wilson May 25, 2009

    There is a black box on the inner fender, drivers side that houses the A/C Cutoff Relay, EEC Relay and the Fuel Pump Relay. You have to remove the box from the side of another box, then realease a tab and slide the unit that holds these relays out. The top of the box is labled for what relays are in each position.



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It may be a bad low pressure cut out switch. You would have to hook the system to a set of gauges and look at the pressures. The low side should cut out at aprox.20 psi. if the switch is bad the compressor will keep running and ice up. The switch is easy to replace. It screws into the dryer (big silver can} it has two wires going to it. It's a cheep fix to try at home.

Posted on May 20, 2009

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  • Bennie Kennedy May 24, 2009

    Do you know what the system pressures are? The low side should be 30-45 or so the high side 140-210 or so. Knowing these would help alot. If it's not the low pressure switch, I would lean toward a flow problem. (may be an orifice tube problem) I'm sorry but with out seeing the pressures, A.C. problems are hard to fix. Have the system serviced with an A.C. machine. Make sure the system has the right amount of freeon, do a 15 min. vacume, add proper amount of freeon then check the pressure.

  • Bennie Kennedy May 25, 2009

    The A.C. cut off switch, where was it located??

  • Bennie Kennedy May 26, 2009

    that's the beauty of ALL-DATA (a program that has everything about everything to do with cars.) If we would have had a wiring schematic we could have seen all the components of the particular system. oh well, glad your A.C. is working.


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There is a cycling switch located on the accumulator at the pass side firewall on the heater box if this sticks the compressor will continually run

Posted on May 20, 2009

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May be the pressure to high,you have to drain(safetly)to the correct pressure

Posted on Jul 06, 2012

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