HVAC Mode Actuator door replacement - Page 71 - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Old 06-19-2019, 10:46 AM
motorhead0922 motorhead0922 is offline
Junior Member
2006 Chevy TrailBlazer LS
Silverstone Metallic 4.2L I6 4X4
Join Date: Aug 2010
Location: Missouri
Posts: 2
I just replaced the mode actuator yesterday, and found the write-up "Replacing HVAC Mode Acuator" on the TrailblazerSSforum to be extremely helpful, especially the pictures of how the two gears fit together. I'd post a link, but I don't have 5 posts here yet.
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Old 07-10-2019, 09:23 PM
LivNowPayL8r's Avatar
LivNowPayL8r LivNowPayL8r is offline
Junior Member
2002 GMC Envoy SLT
Pewter Metallic 4.2L I6 4X4
Join Date: Jul 2009
Location: SE WI
Posts: 3
Just completed mode door actuator replacement

Thanks to the knowledge shared in this thread, I felt pretty confident going in. Job was pretty straight forward & went smoothly. It helps if you are not in a hurry and can get yourself off the floor of the vehicle to stretch once and a while!

The actuator was firmly on the mode door shaft and I was reluctant to lever too much on it for fear of bending or breaking the shaft. I ended up fabricating a tool from some 1 1/2 square tube I had in the garage... made the removal really easy.

I also pulled the old actuator apart and couldn't see any visible failure... I presume the motor or cicuit board failed.
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Old 08-04-2019, 08:27 PM
mnjeepmale mnjeepmale is offline
Junior Member
Join Date: Jan 2019
Posts: 7
I had a problem last week with my drivers side only blowing out hot air. I went and replaced the driver's side blend door actuator and now it goes from hot and cold when the dial is turned.

However I can't get the air to vent on the floor when it's selected. When I select floor it blows out by the windshield. The defrost/windshield and vent only work but not the floor. Is that an actuator issue? I see two other actuators above the gas pedal and I see one moving when I select the different modes.
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Old 09-17-2019, 07:05 AM
Deity Emperor Deity Emperor is offline
New Member
2003 Chevy TrailBlazer LTZ
4.2L I6
Join Date: Sep 2019
Posts: 2
Are the actuators different from each other?

Are each of the actuators different? Or can i buy multiple ones and use it to change each one in my 03 Chevy Trailblazer?
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