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Ford E450 2009" -AC compressor is always on..

I replace relay.. But it same problem.. What is the possible cause

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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detour342
  • 200 Answers

SOURCE: 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

Posted on Jul 13, 2010

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clifford224
  • 1975 Answers

SOURCE: where is the AC compressor relay on 1999 Ford

There's a A/c clutch relay if that's the one your looking for. that relay is located in the power distribution box located in the engine compartment (see picture below). The relay that I am talking about will be in the number 204 position (see picture of layout below). This should be in your owners manual if you have one. If you need an owners manual for your vehicle, email me at csautomotivecars@att.net with your make, model and year and i will be happy to email you one. Don't worry it won't cost you anything. I hope this helps you and good luck. clifford224_64.gifclifford224_65.gif

Posted on Mar 18, 2011

  • 1 Answer

SOURCE: I have a 2006 ford fusion. The ac compressor will

It's the evaporator temperature switch, ford has tsb's out for it. You have to remove the dash board to change it, so far I've done 4 this year and it's only June. FYI it's 1.1 lbs of freon...........

Posted on Jun 30, 2011

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How did you hook up the inline fuse to compressor and ground to compress ? Ground what ? Right at the clutch coil ? You have to be hooking it up wrong . The compressor can't cause the clutch coil to short or blow the fuse , even if the compressor were seized up . An before that would have the serpentine belt would burn up , squealing noise. applying B+ voltage in the relay socket ,pin 30 to pin 87 will engage the compressor clutch . If the fuse blows the wiring from the relay to the compressor clutch is shorted to ground . Look for rubbed through wiring harness .

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Problem is that the AC CUT OFF relay energised permanently. therefore electric clutch of compressor swicthed off permanatly, because current to compressor clutch goes through NC (Normally Closed) contact...


check for the cut off switch or sensor on the a/c plumbing to see if normally closed or normally open, and if it is causing the the AC Cut of relay to be energized permanently.

See if disconnecting the switch on the plumbinug changes anything. Or if using a test light to ground out the terminals does anything different on the AC system.

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1 Answer

No power too my ac compressor on my 2005 ford expedition.i check all fuses/relays i also have power too all my p/switchs


Assuming you dont have a leak which would cause the system to not come on, it is possible the low pressure switch on the system has gone bad preventing system operation.

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