Question about 1995 Dodge Caravan

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1995 dodge caravan, 3.0 engine, I just installed new compressor with new clutch, accumulator, and expansion valve. Obviously there is no refrigerant in system. Clutch will not engage.There is no voltage to it. I jumped the low pressure switch and the electronic cycling switch and have checked the relay and fuse. Still no power to clutch. I know the clutch works by temporarily wiring direct to battery. What next?

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  • Jake Duncan
    Jake Duncan Sep 20, 2009

    what is the thermostat switch you mention to check?

  • Jake Duncan
    Jake Duncan Sep 20, 2009

    1995 Dodge Caravan 3.0 engine. I cannot get A/C clutch to engage. I just installed new compressor/clutch, accumulator, expansion valve. System was flushed and evacuated. I wired across low pressure switch and also the electronic cycling clutch switch (per factory manual). Still the clutch does not engage. I checked fuse and relay and they are OK. What next?

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  • Master
  • 1,865 Answers

Get a haynes book, they provide wiring diagrams in the back of the book. You will then be able to troubleshoot the clutch wiring.

Posted on Sep 20, 2009

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  • Master
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You mention their is no refrigerant in system, the systems must be full and have proper amount of refrigerant in order to activate the pressure switch which will send power to the compressor, is one of safety device to protect the compressor it self from running with low or no refrigerant in the system which can damage the compressor and the systems. Its recommended any time when you open or disconnect the AC line either replacing compressor, expansion valve etc. you will need to have the line vacuum out all the air (oxygen) from the AC unit and then filled with proper amount of refrigerant using the gauges to monitor amount of pressure, too much air in the systems will cause moister, rust, not to cool properly and can damage expansion valve. one thing you have to watch if put too little amount of refrigerant in the system will cause a low pressure will not trip the switch and too much pressure can blow the AC line or a seal. one good reason to vacuum out the line is that to draw out all the air (oxygen) in the line/systems causing a vacuum in the line which will allow you to put more of refrigerant in the systems than trying to force refrigerant in when the systems is all ready full with air (oxygen); you don't want leave any air left in the systems. If you have proper amount of refrigerant in the systems everything else is good such as fuse, relay etc...check your thermostat switch along with pressure switch.

Posted on Sep 20, 2009

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you can try to manually turn the compressor plate in the reverse direction, you could un lock it and hopefully not a amjor problem occurs..

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