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AC temp rising during RPM acceleration
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electrodad
New User
Jul 17, 2015, 5:03 PM
Post #1 of 6
(1732 views)
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AC temp rising during RPM acceleration
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My 06 Malibu recently has stopped cooling like it originally has in the past. We had it checked for leaks @ the local chevy dealership and they cold not find any. I have checked the pressures with a gauge set and during curb idle (in park) we get approx 20 degrees colder from the vents. When the RPMs are raised to approx 2000 the temp rises and no cold air from vents. The pressures goes from 45/175 to 60/150 ....when we go back to curb idle the pressure slowly returns to the 45/175 and the vents blow cold approx 20 degrees colder than ambient. Any ideas? I don't want to waste time and money repairing the wrong thing. Thanks
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 17, 2015, 5:10 PM
Post #2 of 6
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Re: AC temp rising during RPM acceleration
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So, you are saying that the low side rises and the high side drops when you increase the RPMs?
That's not making a lot of sense. Are you sure you don't have that backwards?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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electrodad
New User
Jul 17, 2015, 5:48 PM
Post #3 of 6
(1725 views)
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Re: AC temp rising during RPM acceleration
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I send a link to a you tube video showing the acceleration and back to idle pressures
https://youtu.be/tOdlEpE7HFg
(This post was edited by electrodad on Jul 17, 2015, 6:32 PM)
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Discretesignals
Ultimate Carjunky
/ Moderator
Jul 17, 2015, 6:59 PM
Post #5 of 6
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Re: AC temp rising during RPM acceleration
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The pressures are flucuating when you have the rpms up. It almost kind of looks like maybe the belt or compressor clutch is slipping. If you notice as the high side goes low the low side goes high...like the compressor is slowing down and speeding back up. Weird....
If you observe the front of the compressor while it is fluctuating like that, does anything look unusual?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jul 17, 2015, 7:01 PM)
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 17, 2015, 7:10 PM
Post #6 of 6
(1710 views)
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Re: AC temp rising during RPM acceleration
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It kinda looks like the expansion valve was stuck open or the clutch was slipping.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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