Blend door issues only with rear vents?

2001 CHEVROLET TAHOE
166,000 MILES • 5.3L • V8 • 4WD • AUTOMATIC
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MRHEINZE10
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  • 2 POSTS
I have replaced both actuators up front and have full adjustment ability. My rear HVAC does not have temperature adjustment just fan speed. I pulled off the rear passenger panel to see the system and there was not a blend door or actuator.

When I run heat up front then I turn on the back system the back vents blow ice cold. Did I install it wrong or is there a blend door that is stuck?

Getting frustrated please help!
Jan 29, 2025 at 7:44 PM
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JACOBANDNICKOLAS
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  • 110,175 POSTS
Hi,

There is an air temperature actuator for the rear HVAC. It is located behind the passenger side rear trim panel.

If you look below, I attached the directions for removing and replacing it. Also, the last pic provided the re-calibration process.

Let me know if this helps.

Take care,

Joe

See pics below.
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Jan 29, 2025 at 8:34 PM
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MRHEINZE10
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I took off that panel yesterday and there is no blend door actuator in that area. The controls for the rear are fan speed only.
Jan 30, 2025 at 7:26 AM
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STRAILER
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Has the rear vents ever worked?
Feb 1, 2025 at 9:34 AM