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A/C only cooling at 1300 RPM's or better

jajose on Fri June 25, 2010 12:02 AM User is offline

Year: 2005
Make: chevrolet
Model: equinox
Refrigerant Type: r134
Country of Origin: United States

A/C cools down great at 1300 RPM's or better, but when at idle speeds temp in cabin raises up 15-20 degrees. Any ideas on what to look for would be greatly appreciated. Thanks,in advance!

iceman2555 on Fri June 25, 2010 8:54 AM User is offlineView users profile

A suggestion: Have the system serviced. Recover the refrigerant and record the amount recovered. Compare this to OE specifications for your system. Evacuate the system. Recharge the system to correct OE specifications utilizing the correct recharge equipment. NO CANS....NO PRESSURES....
Re evaluate the performance of the system, record pressures and temperatures. Post results.
This cooling issue could simply be the result of a slightly undercharged system.
Operation of an under charged system will result in compressor failure due to the lack of sufficient refrigerant level/flow to maintain lubricant migration thru the system.

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The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

GM Tech on Fri June 25, 2010 10:03 AM User is offline

How ironic!!!!

Just had one yesterday with exactly the same complaint---and it is a 2005 Equinox!!!! Charge level was right on the money.

Seems the scroll compressor is experiencing some internal issues-as it gets older- such as reed sealing problems or internal blowby---suction pressure is awful- usually 60-70 at idle-- but does do better at higher rpm-- which directly affects vent temps---so what to do-- we tried a new TXV- with absolutely no help--- so its on to a new/used compressor-- seems the local salvage yards are selling them like hotcakes---my best yard says they have sold nearly 20 in the last two weeks alone....so here is another chronic problem emerging--- got to love those expensive scrolls----heck Napa doesn't even list them-- and if they did, I'll bet they are $700 or more--what prices do you guys have for them?

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

bohica2xo on Fri June 25, 2010 1:12 PM User is offline

GM Tech:

Gotta love a scroll. crappy low end performance, gets worse once they wear. The good news is AMA has them for under 500 bucks:

2005 Equinox compressor

B.

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"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

ice-n-tropics on Fri June 25, 2010 6:39 PM User is offline

Before changing comp (scroll or piston type) temporarily/ quickly block condenser air flow with cardboard while checking discharge pressure. If it reaches 375 to 400 psi, then odds compressor is OK is 99%.
Your refrigerant charge is probably a little low.
hotrodac

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Isentropic Efficiency=Ratio of Theoretical Compression Energy/Actual Energy.
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HVargas on Fri June 25, 2010 7:00 PM User is offlineView users profile

There is supposedly an aftermarket unit that is going to be coming out too that will be available for $330.00.

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