2010 Chevrolet Express AC

SHAD ANDRAS

MEMBER
2010 CHEVROLET EXPRESS
V6
2WD
AUTOMATIC
85,000 MILES

I have a 2010 Chevy express 1500 that is blowing 42 degrees at the ac vents while driving but only blows 60 degrees while idling.I cleaned the coils and condensor and also had the pressures checked with gauges. What could else be causing this?

Thursday, May 21st, 2015 AT 12:51 PM

5 Replies

JACOBANDNICKOLAS

MECHANIC
109,650 POSTS

At an idle, the compressor isn't turning as fast to build the pressure needed. It isn't uncommon. If it is fully charged, that's the best it will do. If you know both low and high pressure readings, let me know them so I can make a determination about charge.

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Friday, May 22nd, 2015 AT 5:43 AM

SHAD ANDRAS

MEMBER
3 POSTS

45psi low side and 195-200psi high side but climbs apon acceleration !
Yesterday I unplugged the high pressure switch, then tapped on it with a screw driving, cleaned the plug the plugged back in and today it's blowing at 44 degrees constantly so far.

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Friday, May 22nd, 2015 AT 7:44 AM

JACOBANDNICKOLAS

MECHANIC
109,650 POSTS

Interesting. Those pressures sound perfect. It sounds like maybe the high pressure switch may be going bad and shutting the compressor off at the wrong point allowing the system to warm. When you think about it, at an idle, the under hood temp is higher which will cause the pressures to go up. If the switch is going bad and it kicks off the compressor, the inside temp will go up.

Let me know if it changes for you.

Joe

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Friday, May 22nd, 2015 AT 8:44 AM

SHAD ANDRAS