Question about 2002 GMC Yukon XL

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

Front vents only blows cold air, rear vents operate correctly (blow hot and cold air based on setting). I have checked hoses running to heater and both, supply and return are fairly warm. Fuse for front heater is ok. Car has 102,000 miles and has gone through 100K service by the dealer in Dec.

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  • sjain483 Jan 26, 2009

    Yes, i did check that it is full.

  • sjain483 Jan 26, 2009

    Antifreeze/Coolant level is full.

  • sjain483 Jan 26, 2009

    Thank you for update, can you suggest how can I isolate between the two problems. .

  • Anonymous Mar 13, 2014

    i turn on heater in the front and it blows cold air in the back not being able to manage it from the rear console

  • Anonymous Mar 16, 2014

    Turn truck on and gas gauge and heater blowing cold air

  • Anonymous Mar 16, 2014

    Gas gauge and heater blowing cold air

  • Anonymous Mar 26, 2014

    the rear heat blows cold air and the 4 roof vents dont blow at all

  • Anonymous Mar 26, 2014

    the front has hot air and the rear heat is blowing cold air and the 4 roof vents dont blow at all

  • Anonymous Mar 27, 2014

    no heat at all from front ,floor defrost or any combo? have had core flushed and hoses checked. some have said the heat actuaters might be the problem? not opening ? some heat comes in the rear but not enough. thanks

  • Anonymous Mar 28, 2014

    heater vents wont blow air how do i take the dash apart

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Check you antifreeze level and make sure its full

Posted on Jan 26, 2009

  • Ronnie Houston Jan 26, 2009

    the only other things associated with the heat are the heater core and the thermostat...maybe the thermostat isnt opening all the way to allow heat to the front...

  • Ronnie Houston Jan 26, 2009

    id go with the thermostat first to see if that dosent help its the cheaper repair of the two about 10.00 if you do it yourself. its hard to tell on the heater core if its bad or not unless its leaking water out somewhere..the only other thing i can think of is the water pump....those are the three things most associated with the heating system. i forgot about the water pump or i would have mentioned it as well. but in any case try the thermostat first and see if it wont take care of the problem

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I just don't get why that doesn't work right in the first place. ... I have 99 Yukon that has a problem with the front air. .... $55,000 for my GMC, I guess expecting cold air when we push A/C and getting 90 degree blast ... 2001 Yukon XL 1500 Front heat & air fine, rear ac blows hot as if heater is on in all settings. More results from forums.edmunds.com

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