AC Compressor Clutch Not Engaging - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
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post #1 of 9 (permalink) Old 08-13-2016, 01:48 PM Thread Starter
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AC Compressor Clutch Not Engaging

Car: 2001 Dodge Intrepid SE 2.7L

I recently replaced a hose that had a hole. I tested for vacuum and it holds -30hg for over two hours. So I thought maybe my compressor was bad as it wouldn't click and not spin once AC was turned on.

My clutch moves (I can spin with my hand)
The Clutch does not engage (Click) when turning on AC
I have removed the power connector from the compressor and read 0v with AC control on.
I have checked fuses behind the fuse panel drivers side and all ohm OK.
I have moved relays under the hood around and that does not seem to change anything.
With the power disconnected from the compressor I should read close to battery voltage from what the manual says. I got nothing.
My cooling fans for the radiator work OK.


I will try to find some alligator clips and power the ac compressor. Just not sure which pin is positive and negative.

Any advice or something I'm missing please let me know. Pretty frustrated at this point.
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post #2 of 9 (permalink) Old 08-13-2016, 02:49 PM
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Was the ac working before the leak developed in the hose? Has the system been recharged and at least close to the proper charge?
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post #3 of 9 (permalink) Old 08-13-2016, 03:09 PM Thread Starter
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Was the ac working before the leak developed in the hose? Has the system been recharged and at least close to the proper charge?
AC has not been recharged. No I got the car with the hole in the hose so I never tried or bothered if the compressor engaged or not. I'm not going to waist r-134a and oil charging it if the clutch won't kick on.
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post #4 of 9 (permalink) Old 08-13-2016, 03:25 PM
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AC has not been recharged. . . . I'm not going to waist r-134a and oil charging it if the clutch won't kick on.
Well there's your answer! The ac compressor clutch WILL NOT engage if there isn't any refrigerant in the system or if the system is excessively low. It is designed this way to protect the system from operating without lubrication.
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post #5 of 9 (permalink) Old 08-13-2016, 03:59 PM Thread Starter
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Well there's your answer! The ac compressor clutch WILL NOT engage if there isn't any refrigerant in the system or if the system is excessively low. It is designed this way to protect the system from operating without lubrication.
So you will not get 12v at the power to the clutch?

Dodge Manual: "The compressor clutch engagement is controlled by
several components: the a/c heater control head (ATC
or MTC), the evaporator temperature sensor, the a/c
pressure transducer, the compressor clutch relay, and
the Powertrain Control Module (PCM). The PCM
24 - 8 CONTROLS LH
may delay compressor clutch engagement for up to
thirty seconds. Refer to Electronic Control Modules
for more information on the PCM controls."

Last edited by Novaman; 08-13-2016 at 04:06 PM.
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post #6 of 9 (permalink) Old 08-13-2016, 04:07 PM
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No, not unless the system has refrigerant in it and is turned on.
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post #7 of 9 (permalink) Old 08-13-2016, 04:37 PM Thread Starter
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No, not unless the system has refrigerant in it and is turned on.
I will try it.
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post #8 of 9 (permalink) Old 08-13-2016, 04:43 PM
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What Brandon is alluding to is that the refrigerant pressure transducer (on the high pressure line between the compressor and the condenser) has to be sending a signal to the PCM indicating some minimum static system pressure before the PCM will send 12 volts to the compressor clutch.

FSM schematic shows the ground wire as black, and the switched +12V wire as dark blue/black. You could remove the clutch relay and apply +12V to the relay socket contact output terminal, or you could energize the clutch relay coil by grounding the correct terminal of the coil (the one coming from the PCM). You should consider downloading the FSM for the schematics so you don't mess something up (2nd Gen FSM Factory Service Manual and 42LE Transmission service manual)

Are you replacing the receiver-drier?


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post #9 of 9 (permalink) Old 08-14-2016, 09:17 PM Thread Starter
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Yes I replaced the drier. AC is working! Once it got some freon in there everything started functioning. Best AC out of all of my cars. Cold like a late fall day. Yes I added some oil for the drier and uv dye too.

Thanks for the help guys.
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