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Ac compressor will not kick on.

Compressor is good but will not run when i turn it on.i changed control unit, low pressure switch on compressor also changed computer brain out and it still doesn't work. it will work direct from control switch to ac compressor but it want cycle so there for it freezes up and stop blowing. how do i get it back working properly.

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  • bdgrave21 Aug 20, 2008

    no i was told the switch on compressor was da one i needed to replace. thanx 4 da info,imma get right on it. hope it works.

  • Jonathan Dawson May 11, 2010

    have you replaced the cycling switch that is on the drier? This also is the low pressure switch. The one you are talking about on the compressor is actually the high pressure saftey switch.

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

chiquititas
  • 1010 Answers

SOURCE: AC compressor somtimes won't come on

Replace the compressor.

Posted on Jun 19, 2008

  • 11 Answers

SOURCE: 96 MUSTANG GT AC DONT WORK

check freon in system if not enough freon compressor wont kick in

Posted on Aug 04, 2008

Molson02536
  • 3854 Answers

SOURCE: AC does not work

Check the fuse for the A/C and try refilling the A/C with R134. You can buy the re charge kit at Auto Zone or Wal Mart, almost any Auto parts store. If the system is low on R134 the A/C compressor will not activate to keep it from burning out.
Try checking the fuse first then re charge the system with a can 12oz of R134. Just keep in mind not to over charge the system. Just follow the instruction and you'll be fine.
Keep me posted, be glad to help out.

Posted on May 31, 2009

  • 1 Answer

SOURCE: Dodge Ram AC not blowing cold

By pass both pressure switches one at a time with small wire or a paper clip. If comperssor kicks on replace the swich that you bypassed.
if not it could be the fan clutch ot the compressor. Compressor runs about $400.00

Posted on Jun 23, 2009

  • 38 Answers

SOURCE: My AC Compressor wont kick on. I have the proper amont of freon

replace comp cycling switch

Posted on Jun 24, 2009

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COMPRESSER KICKS ON (blows cold)only ON LOW IF YOU TURN BLOWER ON ANTHING BUT 1 the ac light goes out and compressor kicks off, changed the climate control thing and that didn't fix it!!


that sounds like normal operation to me. might be low on charge therefore won't kick in on high speed due to not damaging the system and running the ac compressor to cause damage. have the system checked at a local shop. if ok, then recheck that everything is plugged in. all sensor on the ac lines. sounds like it might even be the low side cut off switch or plugged orfice tube or something along those lines...best left to a professional with a machine where they can monitor pressures, and proper operation and see what's going on.

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AC not running in my 1998 Jeep Cherokee. Changed AC clutch compressor RELAY, freon level is good, temperature sending unit replaced along with cooling fan! Checked all fuses still good. Can't seem to...


Hello, You have two switches which work off the pressure of the Freon. Both of these switches cut off the power to the compressor. One is for HIGH pressure and the other is for LOW pressure. Check for power at the compressor clutch connector harness while the controls are set and the engine is running. You may have power and a bad clutch.

When you say that the Freon pressure is good, does that mean the pressure is within the proper range? Too much Freon will make the HIGH switch cut off power and too little will make the LOW pressure switch cut off power.

The ideal amount(ozs) of Freon is what is recommended by the Manufactuer and it will provide a moderate amount of pressure of about 35psi-40psi. You can borrow pressure gauges, called Manifold gauges to measure your system at autoparts stores with loaner programs.

The low pressure side of the system is the one you use to induce the Freon to go into an empty system. You can bypass this switch by taking off the connector and putting a "U" shaped jumper into the harness and the compressor clutch should get power to LOCK up all of the time.

You can take off the switch connector at the compressor clutch and then check for power when bypassing the HIGH pressure switch if the LOW pressure switch does not make the system get power. Only, really only bypass the HIGH pressure switch with the clutch connector disconnected. The HIGH switch is there to prevent damage to all of the components from seals to lines to every piece of Freon hardware in the car. Bypassing with the A/C clutch disconnected will allow you to know if power is getting to the compressor clutch.

Finally, you can get FREE wiring and fusebox diagrams through Autozone.com. Just sign and register to their site and then you can print the documents for yourself.

Good luck with this repair and I hope my solution helps you.

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it's either low (in spite of your readings) or your a/c clutch is not working correctly or you have too big an air gap in the clutch.
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report reulsts.

please don't forget to rate.

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Air conditioner won't stay on.


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