HVAC actuators

[YukonDenali03]

A year and a half ago the rear blend door actuator caused me a lot of aggravation, so I set out to figure out how these things work. I compiled my notes into a small document. Hopefully others will find it useful. It's probably more technical than most will be interested in. Let me know if you find errors in the doc.

 

[Tonimus]

Welcome to the forum! Thank you for the information. Very kind of you.

 

[ORVietVet]

Welcome to the forum from Oregon.

Any info about the intermittent problematic blend door actuators, is greatly appreciated.

 

[imaudm]

A year and a half ago the rear blend door actuator caused me a lot of aggravation, so I set out to figure out how these things work. I compiled my notes into a small document. Hopefully others will find it useful. It's probably more technical than most will be interested in. Let me know if you find errors in the doc.

Just don't replace the actuator upside down in your old Suburban like I did

 

[JorgeS]

Awesome! My rear blend works intermittently, and sometimes not at all. This will help me get into it when the weather warms (I'm always afraid of removing plastic panels when it's cold).
I have electrical stuff, including variable voltage supplies and resistors, so I should be able to follow your suggestions.
Thank you.