Question about 2001 GMC Yukon Denali

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2001 GMC Yukon Blows cold air in front heat in back

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

SOURCE: rear heat in 2004 gmc

I have a 2006 yukon and have had to replace the actuator in the rear heat/ac twice.  It moves a valve that closes the cold/hot ducts.  It is a cheap defective part/design.

Posted on Nov 07, 2008

SOURCE: 2001 gmc jimmy engine warm but heater blows cold air

Disconnect the heater hoses from the water pump and the intake manifold. Get a compressor and blow out the hose (put the air hose into the the hose that came off the mainfold. then flush the system and replace the antifreeze.

Posted on Dec 12, 2008

  • 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

motor1258
  • 6674 Answers

SOURCE: Air Conditioning not running cold on 2005 Yukon XL 2500

bigger hose is usually low side.

Posted on Jun 20, 2009

  • 1 Answer

SOURCE: AIR CONDITIONER ONLY BLOWING COLD ON ONE SIDE AFTER DISCONNECTING BATTERY

Turn your AC off. Turn the car off Crank the car turn ac on drivers side to 60 passenger side to 90 press auto wait 1 minute turn AC off (very important) turn car off turn car back on switch driver's side 90 passenger 60 press auto wait one minute turn AC off( very important) turn car off turn car on AC 70 both sides press auto your ac should be blowing cold If not, you have an expensive problem

Posted on Aug 12, 2009

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My heater don't work in my 1999 GMC Yukon all it dose it blow cold air


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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

Nov 18, 2015 | GMC Cars & Trucks

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Passenger side blows cold air--what part could it be


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On my wifes 03' Yukon the rear air conditioning blows hot air no .... Pull the panel off and look at the hot/cold actuator shown in the picture.

Oct 30, 2015 | 2001 Chevrolet Tahoe

1 Answer

2002 gmc yukon xl rear heat blows heat front blows cold air


Try to back wash the heater core first if it doesnt work then its clogged up try to turn the heater on the front with the heater off for the back keep an eye on the temp guage if it goes up than normal then its clogged....

Fyi u have to run the engine for awhile with the heater fan on

Feb 28, 2015 | 2002 GMC Yukon XL

1 Answer

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...


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

May 13, 2014 | 2001 GMC Yukon

1 Answer

Front a/c blows cold air but back is blowing hot air


Could be low on freon, a faulty expansion valve on the rear system, or other issues. Can you tell if the rear ac lines are hot and cold ?

Aug 04, 2012 | 2001 GMC Yukon

1 Answer

2001 yukon gmc a/c blows cold to rear warmer air to front a/c


Could be a blend door problem under the dash.

Jul 05, 2012 | 2001 GMC Yukon

1 Answer

I have a gmc yukon , front a/c works fine, thou the rear a/c does not blow cold air. The fan still works thou once engine is heated up, rear air blows heat.


you have a seperate peice for the rear air in the side panel in the very back of truck that either needs freon or replaced if thats the case you need to take it some where that knows how to change it but when my friends went out it was expensive to have it fixed

Mar 04, 2011 | 2004 GMC Yukon

1 Answer

How can I determine if my compressor is out on my


If you still get cold air out of the rear vents but the front only blows hot air you may have a bad temp door actuator in the dash, it may be stuck on hot and not able to move to cold air. However if you are low on freon with a truck that has front and rear ac then there will be a temp diff between the two. If it is hot air out the front like the heat is on then you have that actuator problem but if it is cool air about the same as the outside air temp then you may be low on freon.

May 23, 2010 | 2004 GMC Yukon

1 Answer

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


check you antifreeze level and make sure its full

Jan 26, 2009 | 2002 GMC Yukon XL

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