Question about 1999 GMC Yukon

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I'm having a problem with the rear AC blower on my 1999 GMC Yukon. For whatever reason, when I turn on the rear AC unit the air that blows is cold and clean but there is a loud high whine that comes from the rear of the vehicle. I think there may be something stuck in the blower but I can't figure out how to take it off and clean it. Suggestions?

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I havent had this problem with my yukon call gmc dealer and ask were its located at

Posted on Aug 19, 2009

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GMC Yukon AC and Heat Questions - Car Forums at Edmunds.com

forums.edmunds.com > Chevrolet > Chevrolet Suburban

Jul 20, 2010 - 30 posts - ‎16 authors
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

1 Answer

My gmc yukon 2000 slt rear ac blows hot air when i have ac . on and the front works fine .


I have a 2000 GMC Savana Van SLT with front and rear AC/Heat. My front would blow hot while the rear blew cold with AC on. It turned out to be low on Freon. It's hard to know if you have the right amount of freon installed because pressures vary depending on the ambient temperatures. So the best way is to remove all the freon then reinstall the recommended amount as listed on the evaporator housing near the firewall. This worked fine for me... works like new after installing the correct amount of freon.

Jul 01, 2014 | 2000 GMC Sierra

1 Answer

2004 gmc yukon xl, rear ac/heat not coming on AT ALL. not blowing or anything. stopped suddenly, and has not come back on. checked all fuses and relays. no problems with the from ac


I will assume the ac is still getting cold, just not blowing.
You wouldn't really know unless you pulled the panel and checked the lines.
Causes include the blower motor, resistor, fuse, or switch.

Jul 06, 2012 | 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

2 Answers

Blower fan on a/c quit blowing in front but still blows and blows cold air in back


first off make sure you have no blown fuse. but front blower motor may be bad. if it does not work in any speedyou can check for power at the wires going to the blower. under dash on passenger side

Aug 10, 2009 | 1999 GMC Yukon

2 Answers

I have a 2004 GMC Yukon with auto climate control. The front a/c is working but the fan will not come on. The rear a/s works fine. Checked fuses, they are all good. Any suggestions?


It's most likely your blower motor control module. Easy fix! Remove the kick plate under the glove compartment and the module is right next to your blower motor - remove the two screws and it will drop right out. Disconnect the wire harness (2 wires) and replace. Good luck!

Jul 28, 2009 | 2003 GMC Yukon

1 Answer

Blower fan does not shut off and AC does not blow cold on MAX


It seems the AC switch is faulty maybe it doesn't contact the compressor wire on the MAX.
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May 09, 2009 | GMC Yukon Cars & Trucks

1 Answer

Rear heat in 2004 gmc yukon blows only cold air when turned to heat. driver heated seat button lights up for only a few seconds and turns off.


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.

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2 Answers

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

Aug 25, 2008 | GMC Sierra Cars & Trucks

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