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A/C is cold then gets warm

Tiny
ANONYMOUS
  • MEMBER
  • 2006 GMC SIERRA
  • 4.8L
  • V8
  • 2WD
  • AUTOMATIC
  • 199,000 MILES
A/C will be cold and after a while (15 minutes to 1 hour) it gets warm. If I shut the truck off and back on it's cold again. This will work every time. The A/C is cold normally and when it gets warm the compressor is not on. If I shut the truck off for just a few seconds the compressor will kick on and it's nice and cold again. It could last 5 minutes or an hour. Some days it will work fine, normally when it is a little cooler out.
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Thursday, March 5th, 2020 AT 9:36 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

Do you have a set of gauges to give me the high and low side readings?

If the low side pressure drops too low, the clutch will disengage and warm air comes out.

Roy
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Friday, March 6th, 2020 AT 5:19 AM

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