Do you hear a ticking noise from your dash when the ignition key is on? Does your car heater blow cold or the air conditioner blow hot? These are signs that a blend door actuator has gone bad.
Link to order a Door Actuator:
About a half hour of your time you can replace this part to get your climate control back working again. Or you can see what you are paying for when taking your car in for repairs.
2007 Hummer H3
A blend door actuator is made up of an electric motor that turns a plastic gear set in one direction or another which is connected to an air control door pivot at the final drive of the unit. An actuator can go bad in of two ways; first the electric motor can burn out rendering the unit non-responsive so nothing changes when the temperature or vent mode controls are moved. Next, the plastic gear set will become brittle and break which will sometimes allow the unit to work while making a ticking or clicking noise and then stop. This is a common problem in most car’s heater and air conditioner systems.
An air blend door actuator is constructed from a plastic housing, a small electric motor and a plastic gear set. A door position sensor is also incorporate into the unit to send feed back information to the climate control computer.
This actuator then moves temperature and air direction doors inside the heater plenum (box) which are designed to control mode settings such as temperature, floor, mid vent, defrost and fresh air or re-circulation modes. They also control hot and cold settings for right and left passenger compartments.
Your car’s climate control computer gives an electrical command to the actuator to start moving the actuator motor to change air direction modes. This direction is according to the temperature chosen by the driver or passenger on dual climate control systems.
Most systems have three to four of these units placed in various areas around the HVAC plenum that control mode operation and will vary by the car make and model.

See HUMMER H3 Playlist for more;

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John C RV says:

The signs that a blend door actuator has gone bad.

Mad Scientist Hut says:

Great DIY, thank you!

Татьяна Кукушкина says:

Спасибо за полезное видео, дорогой друг! Доброго дня и хороших выходных!

Frankie AutoCAD 2D 3D Tutorial Channel says:

very nice how to

Fishman says:

Great job John!

MTRUNK 85 says:

Grabbing your video again Sandals on both the front and the back of you video.

Frankie AutoCAD 2D 3D Tutorial Channel says:

Thx for sharing!

The Italian Food says:

Wow! I watch full video! Like for you! Ciaoo

Mad Scientist Hut says:

Great tutorial, very helpful! Like+

Act Naturally says:

Great replacement video John!! Well shown!! Made it look easy!! +1 LIKE

Danilo's Studio ONE says:

now I'm learning. thanks.

MyBernie33 says:

Bonne continuation et bonne journée
, félicitations
Merci de passer si régulièrement sur notre chaîne

Bonne journée


Sub Ma Please says:

Nice like please

MTRUNK 85 says:

Great fix John keep them rolling.

Sub Ma Please says:

Good day friend. A friend is one who, sees your 1st drop of tears, catches 2nd, stops 3rd and turns the 4th into a smile. Thanks to my lovely friends. A wonderful week ahead. Awesome and Unique stuff, like it very much

Minh TV says:

I well be 2.104

TTN TV says:

Great video…

Just Wonderful VN. says:

Great video .

Ray Hayden, J.D. says:

Dropping another LIKE on your video, Watching and Supporting!

Giỏi Vlogs says:

Helo. Hi my friend from Vietnam. Go to my channel

yaropol80 says:

That ticking noise from a dash happen to many cars. Thanks John for your detailed repair vlog 🙂

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