Blend door issues only with rear vents?

Tiny
MRHEINZE10
  • MEMBER
  • 2001 CHEVROLET TAHOE
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 166,000 MILES
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!
Wednesday, January 29th, 2025 AT 7:44 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 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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Wednesday, January 29th, 2025 AT 8:34 PM
Tiny
MRHEINZE10
  • MEMBER
  • 2 POSTS
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.
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Thursday, January 30th, 2025 AT 7:26 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Has the rear vents ever worked?
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Saturday, February 1st, 2025 AT 9:34 AM

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