Question about 2000 GMC Sierra

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Ac my ac blows cold for a few minutes then eventually blows hot. if I turn the ac or the engine off for a minute or two and start the air, it will blow cold again.

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  • GMC Master
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You would need to find out if the compressor continues to run when the cold air stops.

Posted on Jul 17, 2013

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6ya6ya
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Posted on Jan 02, 2017

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citroenchris
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SOURCE: 1998 gmc sonoma air conditioner - not cold

Check the magnetic clutch is engaged on front of a/c pump, have the motor running, a/c on and fan on high, if the centre hub is static the pump in not switched on, this can happen when the gas pressure gets low.

Posted on Aug 05, 2009

  • 497 Answers

SOURCE: AC sometimes does not blow cold

recharging wouldtn hurt, a mechanic can tell you the level and if needed, but check also your serpentine belt, it might just be loose and worn and not engaging the condenser properly.

Posted on Aug 24, 2009

bluebirdmate
  • 1190 Answers

SOURCE: after running for 20 minutes or more , the heater

Hello: Check the coolant level, fill up the reservoir and run truck, if reservoir shows low again fill it back up. If reservoir was low/empty the check for leaks. Do this before you replace thermostat. The heater core would not create this kind of condition.

Posted on Feb 09, 2011

  • 436 Answers

SOURCE: Replaced the battery on a GMC Sierra 2005. Turned

you have taken the calibration out of sink. you will now have to remove battery power again for about 5 minutes. after this time reconnect the battery. then turn key to on position for 3 minutes but do not touch the heater control or temperature controls. This should allow the heater and ac system to recalibrate. once the 3 minutes is up turn key off and then back on and start truck.. Try your controls again and see what happens. if no change then dealer will have to reprogram the heater control calibration for you.

Posted on Oct 17, 2011

skychief2001
  • 21873 Answers

SOURCE: ac blows cold then hot air

Is the compressor running when it blows hot air ?

Posted on Jul 31, 2012

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Ac blows cold then hot air


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