Question about 2005 GMC Yukon Xl Denali

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A/C won't go higher than lowest setting

The ac does blow cold but only on a low setting, the rear a/c system works fine.

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  • 315 Answers

Hi there, I believe it could be your switch, you will need to have the switch tested and if faulty then you will have to replace it, hope this helps

Posted on Mar 22, 2014

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: AIR CONDITIONER

On most vehicles with front and rear A/C, the two systems are basically independant of each other just sharing the compressor and condensor. It is possible that the Mode Door (controls where the air flow is sent; ie: windshield, vents, floor) is out of adjustment or sticking.

Posted on May 21, 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

  • 1 Answer

SOURCE: Rear ac on 94 surburban blows warm, front is cold.

The rear air has an expansion valve in the rear of the cargo area right next to the rear evaporator. There is no orifice or filter between the condenser and the rear expansion valve so if there is any debris in the line it will clog the expansion valve. The orifice under the hood is only in the front circuit so if the front is cooling and the rear is not, most likely the expansion valve is clogged and needs to be replaced.

There is a factory service bulletin on how to r&r the expansion valve. It requires some cutting since they did not design it to be replaced. Part of the service bulletin is adding an inline filter at the outlet of the condenser before the front and rear flows divide. That will keep the rear from clogging up again.

I have a 94 Suburban and I had to do this in about 1998. With the filter I haven't had any problems since.

Posted on Sep 10, 2009

roniecon
  • 6918 Answers

SOURCE: have a 1999 GMC Suburban

There is a actuator motor not working .The actuator motor moves the temp door,it is located on the bottom of the blower box,under the dash ,in the middle,it is a flat box,with three screws holding it on,change this out and the problem will be fixed.If this was at all helpful,please rate thank you.

Posted on Aug 16, 2010

jsmes1027
  • 749 Answers

SOURCE: 2005 GMC Yukon Denali XL - Climate Control issue-

Are you aware of any codes that may stored in the body control module and do you hear a clicking or ticking noise in the rear?

Posted on Nov 02, 2010

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AC works for about 300 miles then stops and blows hot air. New AC compressor and freon charge. After sitting for a while it will again blow cold.


I think you have a similar problem to mine. At highway speeds is when it happens. And it is not blazing hot? Right?
Your evaporator is freezing up - as this happens the ice surrounding it prevents the flow of air over the evaporator coils and the result is warm air coming out of the registers. If I turn off the AC for about ten minutes and let unit melt the cold air comes back. This does not occur in stop and go driving.
I combat it by either running the fan at a higher than normal setting to increase air flow over the evaporator and then turning off when it gets too cold, OR using the air control to allow warmer outside air to enter into unit at highway speeds to prevent freezing up.
Newer cars have more sophisticated sensors and controls to prevent this but some older vehicles are subject to this anomaly.
Since it works fine under normal conditions I have not messed around with the freon level in system. If you release a tad of refrigerant the low pressure switch will shut off the compressor sooner and help minimize ice buildup. Good luck.

Aug 19, 2016 | 2000 Ford Taurus

1 Answer

Front AC cold but Rear AC very hot


Not likely, but Is Hot water flowing to heater coil in back? How hot is "very hot" Is it a refrigerant line? If a refrigirant line, Very Hot means it is hot gas from the compressor that "should be going to the condenser coil usually in front of the radiator. It's almost impossible for that Hot refrigerant gas to go to the cooling coil in the back unless you had some repairs done and they weren't certified. My guess is the radiator hot water is not being controlled properly, due to bad valve or control system components.

Jun 07, 2015 | 2009 Saturn Outlook XR

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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

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

I have a 2004 pacifica and my ac blows hot air unless its less than 67 degrees outside. Anything higher then it blows heat and just spurts of cold air.


You quite likely have a low state of charge in the AC system, have a shop hook up a set of AC system pressure gauges and verify that the system is low on charge.

Jul 25, 2012 | 2004 Chrysler Pacifica

1 Answer

1991 Mercedes Benz AC Cycling Switch /Compressor Clutch Won't Engage Completly Spins 1/6 of a complete spin repetedly then stops


You need to have the refrigerant charge level checked, it sounds like it is low. You Need a set of AC pressure gauges to do this testing. If the system has a low charge the pressures will be very low in the low side testing port.

Jun 26, 2012 | Cars & Trucks

2 Answers

2003 Suzuki XL7 A/C won't stay on


The low pressure is in the grill by the radiator. The issue your having with it cutting off then on is easily fixed by removing some of the AC coolant. Any ideas on why the rear AC is not working? Is there a seperate fuse for the rear AC? It just blows warm air.

Mar 20, 2009 | 2005 Suzuki XL-7

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