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My a/c compressor clutch is not engaging and i was wondering how i can check to make sure the proper power is even telling it to come on or if the clutch is shot

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Connect a 12 volt supply directly from the Battery, to the A/C clutch power terminals, with use of 2 lengths of 14 gauge wire. If the clutch engages, then the fault is probably, a lack of Freon. Beg or borrow a set of A/C pressure gauges, to determine the pressure, if any, still in the system. If it is Zero, you have a leak problem. If it is very low, a simple recharge, may be all that is needed.
Regards, DT

Posted on Mar 31, 2011

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2003 Ford Windstar AC is not working. It only blows out hot air. The blend door act. works properly(We have already tested it). There are properly freon in the Vehicle. We are at a lost. Please help


Can you tell if compressor clutch is engaged? If clutch isn't engaged only the belt pulley will be moving and the compressor clutch is not engaged. If not engaged, no ac.

Can you check for applicable hvac codes? To check codes, your-self, at the least, you need an obd2 code reader, that will check manufacturer specific codes as well as po.

I haven't looked at your wiring, you could probably check voltage and ground for compressor, hvac on.6158ef87-8677-4b29-952a-e287698970b5.jpg
In the diagram, you see applicable fuses--clutch relay-- the top wire at ac clutch is voltage--black wire is ground.

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Hi my name is leo and I have a 2002 jeep Cherokee Laredo a/c clutch will engage


Faulty low pressure switch , Google it to see how to replace, or you an unlucky it and run a jumper wire between the terminals/ But beware- bypassing the low pressure switch can ruin the compressor if it gets low on freon.

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Unplug the power lead from the AC compressor.If it stays locked up it a mechanical issue with the new Clutch. If it unlocks check the following. Look at the AC Relay. If it has fused or failed in the closed position the ac clutch will remain engaged. As I don't have the vehicle details I can't provide further details

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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.

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My 07 Honda crv A/C compressor will not engage. On board DTC, fuses and relays check OK. What could the problem be, most likely?


If you have already checked pressure or put in a can of freon, then it could be the compressor clutch is bad or is not being energized.
Check for voltage at the wire to the compressor clutch, and that the compressor is properly grounded.
If you want to by pass the relay and control for the relay, just power the clutch wire with a jumper. You should see the center of the compressor hub start to spin along with the rim of the pulley.

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1 Answer

A/c quit but does have pressure in system and light on in panel. Compressor clutch not engaged, belt is turning pully.


This sounds like the compressor has failed. With AC in on position the compressor clutch should engage/disengage periodically while turning. A couple things to check before replacing this is the following.

1)Check the fuse panel to ensure there is power getting to that part of the sysem.

2)Check the wiring harness itself and make sure the connection is tight, free of dirt, debris and is in good shape.

If those two are okay, I would replace compressor and recharge the system and it should work properly.

Let me know,

Chip

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1 Answer

Air Conditioniong not working


U may be low in Freon gas.
When Freon is low there's low pressure switch that will prevent A/C compressor clutch from engaging to protect it from failure.
So, first check Freon pressure & any leaks form lines & hoses fittings.
Even if the fan is working, that doesn’t indicate proper compressor OP'S.
Look at the compressor front side you'll see the clutch stationary while the AFT pulley moving.

Then put air-condition compressor switch to ON (Engage),
You should see the clutch engage & start rotate,
If NOT, this is very clear indication u r low in Freon.

Regards;
MAR

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Cannot locate where the a/c clutch cycle switch is... there is no power in the wires to the clutch and fuses are okay.


The a/c clutch is attached to the front of your a/c compressor. It is the part that your serpentine belt runs on. It is either engaged or not based on the demand of the a/c system. It will not run if it senses low pressure in the freon supply line so you might try having the system checked for proper fill before replacing the clutch.

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check to make sure the a/c system is fully charged, if it is not the system will not turn on, if you need more help get back to me. please rate my fix as i strive to be the best

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