04 Suburban Blend Door Issues

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tiktok4321

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I have an 04 Suburban LT with the digital AC control unit. My vehicle will often start with all air blowing cold. Sometimes - not all the time - the driver's side will turn to hot. I've replaced the blend door actuator several times - from OEM to cheap. Same problem repeats itself. Would changing out the control unit help? I may change it anyway - the dials don't like to track properly (ie, turn clockwise and temp jumps between going up and down to random numbers). Has changing that ever fixed the blend door issue? Obviously the actuator isn't stuck. It's very capable of moving, just moves to different positions whenever it wants to.
 

strutaeng

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There's a temperature sensor on the headliner on the driver's side that can also cause the issues with temperature working only on cold, or either hot only.

I changed it on my 06 Suburban and that problem was fixed. There's a thread here on that...Edit: https://www.tahoeyukonforum.com/threads/2004-denali-climate-control-is-only-hot-or-cold.146629/

Mine also does the knob thing where clockwise will actually lower the temperature. Mine only does it when cold. Holding the knob down while turning it slowly is kinda my short term fix.
 
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Fless

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There may also be an updated "calibration" for the control. The firmware version would need to be read by a capable scanner (e.g., Tech 2) and compared to what's available for your VIN (dealer or GM programming site).
 

Joseph Garcia

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^^^^^x2^^^^^ As stated above, you can use a bi-directional scanner to calibrate the movement of the blend door.
 

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