Air conditioner clutch wont engage

Tiny
RUSSMAN948@AOL.COM
  • MEMBER
  • 2001 NISSAN FRONTIER
  • 3.3L
  • V6
  • 2WD
  • AUTOMATIC
  • 216,000 MILES
I bought this truck not to long ago and noticed the air conditioner did not work. So I checked the high pressure and it was extremely too high so I let the pressure out to where it should be. After that I noticed the clutch still did not engage, so I direct wired the compressor to the battery and the clutch engaged. I proceeded to buy a new air conditioner relay and the clutch still did not engage?
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Friday, August 5th, 2016 AT 7:20 PM

17 Replies

Tiny
SATURNTECH9
  • EXPERT
So with the air conditioner compressor not working the pressure on the high side read too high? What did it read before you started letting charge out of the system?
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Friday, August 5th, 2016 AT 7:43 PM
Tiny
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It was between 120-150 psi.
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Saturday, August 6th, 2016 AT 7:20 AM
Tiny
SATURNTECH9
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I have seen 120 psi without the compressor running. That is just the pressure of the gas. So has the air conditioner ever worked since you have owned it? If so was this the first time it stopped blowing cold?
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Saturday, August 6th, 2016 AT 11:48 AM
Tiny
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No, it has never worked. I have only owned the truck for a week.
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Saturday, August 6th, 2016 AT 7:34 PM
Tiny
SATURNTECH9
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Okay, so what is the pressure now? One problem is we do not know if the system is fully charged under charged or over charged. Have you checked the high/pressure switch?
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Saturday, August 6th, 2016 AT 7:42 PM
Tiny
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How do you test it? I have taken the connector off and put my test light in it and it does not light up, but it changes the rpm's?
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Saturday, August 6th, 2016 AT 8:38 PM
Tiny
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Also the pressure last night was 35 psi.
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Saturday, August 6th, 2016 AT 8:42 PM
Tiny
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Also, when I turn the truck on and I put it on max air conditioner it changes the rpm's, but the clutch is not engaged.
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Saturday, August 6th, 2016 AT 8:47 PM
Tiny
SATURNTECH9
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35 psi is low for static pressure. Sometimes the computer will kick up the rpm's when the air conditioner is turned on. The pressure switch simply connects the two wires together to it when the correct pressure is pushed against it. You can use a ohms meter to see if it is connecting to let the air conditioner compressor come on.
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Saturday, August 6th, 2016 AT 8:59 PM
Tiny
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I will try that in the morning. What psi should I be at? Air conditioner's are not my specalty. Lol
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Saturday, August 6th, 2016 AT 9:12 PM
Tiny
SATURNTECH9
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I will see what I can find out Ia m not exactly sure, but most I have seen are 80 psi plus. Also, try this start it up turn on the air conditioner and jump the terminals of the pressure sensor connector and see if the air conditioner compressor turns on only jump it for a few seconds.
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Saturday, August 6th, 2016 AT 9:18 PM
Tiny
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23-33 psi between terminals one and three there should be continuity on the high /low switch itself.
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Saturday, August 6th, 2016 AT 10:48 PM
Tiny
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So, I put my volt meter on it and it is getting power, when I re-hooked the connector back up to the pressure switch the rpm's went up then back down.
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Sunday, August 7th, 2016 AT 7:45 AM
Tiny
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You are not looking for voltage your looking for continuity across pins one and three on the pressure switch itself.
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Sunday, August 7th, 2016 AT 9:10 AM
Tiny
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How do I test continuity?
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Sunday, August 7th, 2016 AT 9:32 AM
Tiny
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Sorry stupid auto correct how do I test continuity?
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Sunday, August 7th, 2016 AT 9:32 AM
Tiny
SATURNTECH9
  • EXPERT
https://www.2carpros.com/articles/how-to-use-a-voltmeter

I posted the link to how to check continuity.
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Sunday, August 7th, 2016 AT 6:37 PM

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