Question about 2008 GMC Yukon

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Rear Climate Control knobs don't work

I bought a brand new Yukon SLE and the climate control knobs in the back seat are not working and the vent in the roof will not work. Any suggestions?

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Make sure that the "AUX" button is on, or they will not work.

Posted on Jul 14, 2008


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1997 Ford Taurus front defrost not working

. Air won't blow out of the floor or center vents just defrost ? Do you have manual or automatic climate control ?
Air Flow Control
Air flow control is accomplished in the following manner:
  • Primary control is through the function selector knob mounted on the A/C-heater function selector switch, which is part of the integrated control panel.
  • The function selector knob has the following positions: OFF, MAX A/C, A/C, PANEL, PANEL/FLOOR, FLOOR, FLOOR/DEFROST and DEFROST. The A/C-heater function selector switch combines a vacuum selector valve with an internal electrical switch.
  • The vacuum selector valve directs source vacuum to various vacuum control motors (18A318). Refer to the Vacuum Control Diagram , System Airflow Schematics and Vacuum Control Chart .
  • Two internal, single-pole electrical switches are also controlled by the A/C-heater function selector switch. The combination of these electrical switches controls the electrical supply to the A/C clutch and heater blower motor switch (18578).
  • The position of the function selector knob determines the manner in which the system will operate.
  • Each position of the function selector knob is detented for positive engagement.
  • Vacuum Control Motors The vacuum control motors (18A318):
    • are located on the A/C evaporator housing, A/C recirculation air duct and heater air plenum chamber (18471).
    • direct system airflow to the vehicle interior as determined by the remote climate control module or manual override.
    • The five-passenger seating configuration has an additional vacuum control motor mounted on the heater air plenum chamber to control airflow to the rear seat A/C register (19893).

vacuum control motor-i4bq0ig33y1522pr2d2rrkk3-2-0.gif

Jul 09, 2017 | Ford Cars & Trucks

1 Answer

Passenger side knobs not working on climate control unit

All 3 are possible problems. A fuse is most likely the problem unless something got spilled leaked its way into the unit. Check all the fuses with a test light first before you try and replace the unit

Dec 26, 2013 | 2006 Audi A6

1 Answer

Air blend door actuator

Possible bad blend door actuator .some gm cars can be relearned to the new climate control head

Jul 28, 2013 | 2001 Oldsmobile Aurora

1 Answer


Rear heat not working ? The blower motor isn't working ? No air coming from the rear vent's ? Is it just a yukon or XL or denali ? What size engine ? 4.8 , 5.3 or 6.0 l Manual or automatic climate control ? Does the blower motor work on any speed ? The front an rear heater system are seperate , have there own electrical circuits . Could have a couple of different systems ,could have a control processor or relay's an a resistor block . Do you know how to test automotive electrical circuit's using a wiring diagram and a DVOM - digital volt ohm meter ? Plus to get at the rear heater-A/C unit you would need to take the right rear trim panel off .
2003 Tahoe No Rear Heat Fix Suburban Yukon XL Repair

Dec 08, 2017 | 2005 GMC Yukon

1 Answer

1995 Yukon blower and air direction do not work

I had the same problem. Fixed it by changing the climate control knob assembly on the dash. I was able to get a brand new one still in the box on ebay. Cost $150.00 the 1995 will not interchange with any other year even though others look similar the back is different. New they wil run into the $300.00 range. You get all knobs and switches including the push buttons for the AC. These units require a gentle touch easy to break. Good luck.

Nov 26, 2012 | 1995 GMC Yukon

1 Answer

My climate control only blows out cold air but the rear climate control works as it should

Could be the controller or a faulty blend door.
The blend doors direct air thru the heater core and evaporator along with the vents. The controller uses electric motors to change the direction of air flow.

Sep 28, 2012 | 1999 GMC Suburban

1 Answer

Have a 2005 yukon xl with climate control a/c blows warm air

Does the front blow cold ? Diagnosing rear problems
Taking to a qualified repair shop an having it diagnosed would be your best bet >

Dec 13, 2017 | 2005 GMC Yukon Xl Denali

1 Answer

Rear HVAC fan not working

is there another control switch in the backseat of the vehicle that is turned off

Sep 06, 2009 | 2003 GMC Yukon Denali

2 Answers

2003 escalade rear climate control no heat just cold air.

there are two separate actuators for the rear system. one controls temperature and the other controls vents from head to feet. mine problem was the later. that acutuator for esv 2003 is 89018365. it is located just below third seat cup holder passenger side and can be replaced simply by removing cup holder. triangular shaped part with wire harness.

Feb 25, 2009 | 2003 Cadillac Escalade Esv

1 Answer

Unknown motor running inside headbord in rear cargo area

Is the "Rear Air" control switch above the driver seat turned to "Rear" if so, turn it to "off" or Front and you can control the climate for the rear cabin. If this does not work, then a relay may be stuck.

Dec 25, 2008 | 2003 GMC Yukon Denali

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