Question about 2001 GMC Yukon

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Why does the air conditioning in my 2003 GMC Yukon blow cold in the front but HOT in the back like the heat is on. It blows good just hot air. I have read that it could be the heater valve not closing...Is the the same thing as the blend door actuator? Should I start with that or the rear ac expansion valve? I have read that it could be many things. Is there one that would be more likely than the others???

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  • 72 Answers

To check the rear expansion valve, see if the a/c lines are different temperatures. One line to the rear evaporator should be hot and the other cold if it is working.
Try to recailbrate the blend door actuator. Remove the HVAC module fuse. Wait at least 15 seconds. Replace it, turn the key on and wait 40 seconds

Posted on May 13, 2014

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Posted on Jan 02, 2017

badliljess
  • 83 Answers

SOURCE: My 2001 Yukon front heater

Check your heater control valves.

Posted on Jan 19, 2011

  • 2920 Answers

SOURCE: 2002 GMC Yukon blows cold air from the front, rear works fine

check you antifreeze level and make sure its full

Posted on Jan 26, 2009

honeymokey
  • 3113 Answers

SOURCE: air blend door

Replace the broken actuator.

Posted on Apr 15, 2009

  • 144 Answers

SOURCE: the rear a/c on my 1996 gmc suburban is blowing

the problem is in the rear expansion valve. this valve is located at the rear evaporator core. i am assuming the freon level has been checked and is ok. this is a common problem with these vehicles. hope this helps!!

Posted on Sep 04, 2009

  • 1 Answer

SOURCE: Air conditioner blows hot air after 30 seconds on

I have had this problem. I am not a mechanic...so to correct the issue temporarily, I simply turn off the car and restart. This has worked everytime for me. In extreme cases, I think you can also remove the AC fuse and start the car, which will also reset the computer. I also think that by taking the climate control off the "AUTO" setting has worked in the past.

Posted on Oct 27, 2009

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