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Technical Discussions This forum is for technical discussions related to customizing your Tahoe/Yukon

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Old 05-11-2019, 05:42 PM   #1
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Default 2004 Automatic A/C No Heat Drivers Side - Need HVAC Expert

I need some help with my Auto A/C. I had 3 problems to start with, now just one. I replaced passenger side blend door Actuator (lots of fun) and it now works. The Mode actuator was making clicking noises and was about to fail, so replaced that one, and it works well.

Third problem is the drivers side blend. Always blows cold. When I call for heat the mode actuator puts air at the floor, but its cold. Passenger side works fine.

The new driver side actuator (near floor on pass. side) goes through range of motion during fuse pull and replace "calibration", so the actuator works and the controller can make it move.

For some reason the controller is not commanding the actuator to heat.

Anyone have diagnostic suggestions? There's a temp sensor in the duct. Could that be the culprit?

Thanks in advance for any advice!
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Old 08-06-2019, 12:42 AM   #2
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wow, 561 views but no replies...guess I'm in deep do do with this one!
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