High pressure switch causing A/C compressor to disengage?

Tiny
PASSBALL35
  • MEMBER
  • 2005 FORD MUSTANG
  • 108,000 MILES
Problem with a/c high pressure switch causing a/c compressor to disengage, a/c blows cold if I unplug the switch? I have a 2005 mustang v6 having problem with a/c high pressure cut out switch. When the plug is plugged into it it makes the compressor disengage, if I just unplug it the compressor kicks righ on and a/c blows cold but if I turn the a/c off from inside the car the compressor stays ingaged and lines will begin to freeze, so I have to keep the a/c inside the car turned on at all times. I have replaced the high pressure switch but still does the same thing. Had a shop replace compressor, accumulator, exc. And hi and low pressure readings are good, but the high pressure switch still cuts the compressor off when plugged i?
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Wednesday, July 4th, 2012 AT 3:13 PM

9 Replies

Tiny
ASEMASTER6371
  • EXPERT
Hello,

Looking at the air conditioner wiring diagrams it looks like you have a bad ground at the high pressure sensor. Here is a guide and the wring diagrams so you can confirm the failure.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Check out the diagrams (Below)

Please run this test and get back to us.

Cheers
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Wednesday, July 4th, 2012 AT 3:15 PM
Tiny
PASSBALL35
  • MEMBER
I don't know, I took it to a shop and they checked the readings and told me hi & low pressure readings were good?
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Wednesday, July 4th, 2012 AT 3:21 PM
Tiny
ASEMASTER6371
  • EXPERT
Is that the reason you took it there for the repair? If it is, then they did not do there job.

Knowing the pressure readings are important to us helping you further

Roy
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Wednesday, July 4th, 2012 AT 3:23 PM
Tiny
PASSBALL35
  • MEMBER
No I took it there because the a/c had a bad leak from the accumulator, and the a/c compressor was shot, this problem with the high pressure switch I had before these other problems, and before these repairs.
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Wednesday, July 4th, 2012 AT 4:17 PM
Tiny
PASSBALL35
  • MEMBER
Fan is operating, and knowing the repairs that have been done, and assuming the pressures are good, plug that plugs into the pressure switch looks fine, what else could I check?
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Wednesday, July 4th, 2012 AT 4:20 PM
Tiny
ASEMASTER6371
  • EXPERT
What did the shop that did the repairs tell you?

Roy
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Wednesday, July 4th, 2012 AT 4:46 PM
Tiny
PASSBALL35
  • MEMBER
Replace pressure switch, but I have already replaced it. Still same out come.
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Wednesday, July 4th, 2012 AT 4:48 PM
Tiny
PASSBALL35
  • MEMBER
So I dint know much about wiring so my buddy looked at it and yes you where right the ground wire was off all fixed working great. Thanks for your help.
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Wednesday, July 4th, 2012 AT 4:49 PM
Tiny
ASEMASTER6371
  • EXPERT
Nice work, we are here to help, please use 2CarPros anytime.

Cheers, Roy
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Wednesday, July 4th, 2012 AT 5:03 PM

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