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Chris (aka-Moose)
Chris (aka-Moose), Technician
Category: Car
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Experience:  16 years of experience
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Buick Rendezvous Ultra: I have a 2005 buick rendezvous. The

Resolved Question:

I have a 2005 buick rendezvous. The A/C works but compressor runs off and on - it acts like thermostat is not reading the temperature in the cabin or something.
I am wondering if it may be a control panel issue, pressure switch or maybe A/C clutch? It will cycle on every 5-10 minutes for about 5-10 minutes, then it is just vent temperature air.
Submitted: 1 year ago.
Category: Car
Expert:  Chris (aka-Moose) replied 1 year ago.

Hello, I'm Chris. Thanks for visiting Just Answer.

 

 

I am sorry you have had to wait so long for the first contact. Sometimes this happens when the question you ask is not detailed enough or its just hard to address online. Many have viewed your post, but have passed. I am checking to see if you still need help.



I am not going to lie, this concern is not my strongest point, but I will do my best to help you. I have access to many repair sites, so at the least I can provide something to address at least part of your concern if it is not something I can address from memory and experience.



I mainly work in the last half of the day, so that is when I do all of my responding. If there is anything else you can add to your concern to help me out more so I can help you out in turn please do so in your next reply.



Once you get an answer, you will be prompted to rate me. You are rating my help, not the website, or answer. If you feel the need to rate negative, please save the rating so I can try again or find someone whom may be able to help better.



Thanks for using our site, we will do all we can to earn your business, again sorry we did not get to you sooner.



Chris

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Customer: replied 1 year ago.

Thanks for the reply Chris.


 


So here is what I know (or think I know).


 


I am confident it is not a compressor issue or Freon issue as when the A/C is "on", it is nice and cold. For some reason, all of the sudden, the A/C developed this issue where the A/C won't run consistently as needed. Some days it will work for longer periods of time, then is it just vent air without any A/C, then the A/C will kick back on for a short time. There doesn't seem to be a definable period that the A/C will run.


 


It "acts" like the climate control thermostat is not working properly - as if it is not sending a signal to engage/disengage the clutch.


 


No matter where I set the temperature or play with the climate controls, I can not keep the A/C running dependably for any length of time.


 


The condenser is clean, the freon and compressor seems to be fine because it is cold when the system is engaged. So I wonder if it sounds more like a pressure switch or control panel issue? (or something else)

Expert:  Chris (aka-Moose) replied 1 year ago.

We need to start by ruling out a weak compressor clutch by checking to see if there is power commanded to the clutch when the compressor should be running but is not. See the diagrams below

https://dl.dropboxusercontent.com/u/90220402/05buickac1.jpg

https://dl.dropboxusercontent.com/u/90220402/05buickac2.jpg

The power wire is the dark green wire.

 

Chris (aka-Moose), Technician
Category: Car
Satisfied Customers: 33412
Experience: 16 years of experience
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