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A/C works sometime

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Old 10-08-2018, 11:31 AM
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Question A/C works sometime

2008 saturn aura 2.4L i have a static pressure of 100 psi on both low and high gauge when a/c clutch engage and running. no cool when come in it cool well. can anyone explain? i am still trying to figure it out.
 

Last edited by sadatt; 10-08-2018 at 11:42 AM.
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Old 10-08-2018, 12:01 PM
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The L series has a variable displacement compressor, mine stuck at zero displacement and I had to replace it. Check to see if your car uses a similar compressor, that could be all that is wrong.
 
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Old 10-09-2018, 12:21 AM
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Originally Posted by 02 LW300 View Post
The L series has a variable displacement compressor, mine stuck at zero displacement and I had to replace it. Check to see if your car uses a similar compressor, that could be all that is wrong.
Thank you, I will check
 
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Old 10-10-2018, 05:02 AM
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What is the benefit of this type of compressor? What controls the displacement?
 
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Old 10-10-2018, 11:33 AM
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The system is controlled by an expansion valve at the firewall. Several manufacturers have used this system over the years. It allows for constant compressor operation with variable flow. My mother’s Cadillac had a similar system back in the sixties smooth operation with no clutch cycling.
 
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Old 10-10-2018, 04:55 PM
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Ah, THAT'S what the thermal expansion valve does!

Another of life's mysteries solved.....
 
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