Question about 2001 Jeep Grand Cherokee

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2001 jeep cherokee sport 4.0L

Cooling fan and ac compressor has no power. I jumped power to fan that works. I jumped power to compressor clutch that works any ideas. I also checked the fuses.

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  • 335 Answers

Is there power to the A/C relay? Did you receive the wiring diagram i sent to you?

Posted on Aug 21, 2008

  • Randy Harkins
    Randy Harkins Aug 21, 2008

    What I know about A/C is that if there is no pressure in the system the compressor will not work it never receives the message from the low and high pressure sensors in the circuit.

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94 accord ac not working. Jumped compressor off hot post on battery ac clutch came on and started cooling. Change ac fan relay and ac clutch relay. Did a by pass on the pressure switch. Nothing helps.


There are 2 pressure switches on it. High and low. Make sure you jumped the high switch. If so, the ECM could be bad. Check wiring first. Low refrigerant could be the problem also.

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No electrical power to AC Compressor. The switch light comes on in car when AC power button is turned on.


  1. Check if air blows with the fan setting turned to high.
  2. Check that the radiator cooling fan engages when the A/C button is pressed.
  3. Locate the compressor.
  4. Turn on the A/C.
  5. Check if the compressor's clutch has been engaged.
  6. If the clutch engages, the fault is elsewhere.
  7. If the clutch does not engage, check for power to the clutch.
These steps might help find the problem.

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Compressor and fans do not turn on until rev engine


I passed this question the first time I read it, so I will take a stab at it now.
The fans don't come on until the compressor has pumped the freon pressure up to say 150 or 200 psi. And the compressor clutch has to have voltage to engage the clutch.
I wonder if the clutch is going and needs 14 volts instead of 12 to engage ? Or the relay that powers the clutch ?
Speeding up the engine would increase voltage from the alternator.
This is assuming the serpentine belt is tight and everything else is working correctly.
I think I would swap the relay with another and put a meter on that circuit to the ac clutch to see what it takes to engage it.

Jul 24, 2012 | 1992 Buick Regal

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Replaced the ac compressor but now no power to compressor but have power to low and high pressure switches. checked relay under hood, relay and fuse in cabin. what am i missing?


Put a jump wire in the high pressure switch plug. If the compressor works. replace the high pressure switch. Let me know and we can go from there.

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Location of ac high pressure cutout switch on a 97 Plymouth voyager. Could it be a different problem? Had to replaced the PCM and a couple sensors because of a short in the wiring cluster. Now the ac...


HIGH PRESSURE CUTOFF SWITCH LOCATED ON AC COMPRESSOR DISCHARGE LINE LEADING TO THE CONDENSOR.THE HIGH PRESSURE CUTOFF SWITCH WILL CUT OFF THE AC COMPRESSOR IF SYSTEM PRESSURE RISES TO HIGH CAUSED BY RESTRICTION IN THE REFRIGERANT CIRCUIT OR OVERHEATED CONDENSOR.MAKE SURE COOLING FAN IS RUNNING WHEN THE AC SWITCH IS ON.THE COOLING FAN KEEP CONDENSOR COOL, IF COOLING FAN DONT RUN.YOUR AC WILL STOP BLOWING COLD AIR.HAVE THE REFRIGERANT SYSTEM CHECK OUT.MAKE SURE YOUR LOW SIDE PRESSURE IS 10 - 37 PSI. THE HIGH SIDE PRESSURE SHOULD BE 112 - 210 PSI. CHECK THE AC COMPRESSOR CLUTCH FUSE AND RELAY.

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Jump air compressor ac works replace relays same issue HONDA


the compressor may be low on freopn but, the fan problem is most likely the fan motor as it is the low temp fan and will run more often than both fans...to test see if you can switch the fan plugin to the other fan watch carefully that it does not get too hot as the second fan is a safety fan that works as high temp or when using the A\C

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AC is not working properly


this first to do is check wiring to compressor clutch,when ac is not working check the ac clutch it should be engaged,test for power and ground at ac compressor clutch, you may have a bad wire to clutch or a bad compressor clutch,8226523.pngc97e168.giff41b56b.gif672ce29.gif

Mar 04, 2010 | 2003 Nissan Pathfinder

1 Answer

Ac don't work


check a/c compressor by pulling compressor relay and jumping relay switch if cluch engadges you have a short if not
replace compressor.

Jul 20, 2008 | 2000 Mercury Grand Marquis

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