Heat Blend Door Actuator

EDELL

MEMBER
2003 OLDSMOBILE ALERO
4 CYL
FWD
MANUAL
104,000 MILES

The heat does not come on when I change the temperture controll to warm. It is vacume and I do not hear any noise when I turn the controll. However I cannot find anywhere either in my owner manual, repair manual nor so far on the internet at to where this actuator is, or how to change it.
Thank you for your assistance.

11 Replies

JACOBANDNICKOLAS

MECHANIC
109,740 POSTS

The actuator will be on the HVAC system under the dash on the passenger side. It is attached to the heater core box.

Here's a guide on changing the actuator, not your exact car but it is very similar

https://www.2carpros.com/articles/replace-blend-door-motor

See the diagrams below for replacing it

Images (Click to make bigger)

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Thursday, February 7th, 2019 AT 7:05 PM (Merged)

BOBSHAWESCAPE

MEMBER
2 POSTS
2003 OLDSMOBILE ALERO
6 CYL
FWD
AUTOMATIC
56,000 MILES

My girlfriends Alero heater controls allow only the high speed on heater/ac control and the heat/ac only comes through the vents (not defrost, floor, mix, etc.). From what I've read on the net the blower speed problems can be resolved with a new blower resistor. Fine I can handle that but anybody have some ideas on the lack of vent, defrost, floor controls?

Any help is much appreciated,

Bob

ps

its a wisconsin winter so I need any help to make this work

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Thursday, February 7th, 2019 AT 7:05 PM (Merged)

IMPALASS

MECHANIC
3,112 POSTS

Hello

The doors are control by a vacuum hose that is coming off of the intake manifold. I can't seem to locate that hose so you are going to have to search around. Since all the doors do not work, my guess is that one main vacuum is either not working or disconnected.

I have attached the vacuum diagram for the doors as you see to the left..they all work off of the one main vacuum..that would be my guess.

I have also attached the location for the relay and the resistor.

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Thursday, February 7th, 2019 AT 7:05 PM (Merged)

BOBSHAWESCAPE

MEMBER
2 POSTS

The vacuum hose im looking for is typically a small rubber hose? And coming right off the intake manifold? Sorry to ask but I can't read the writing in the pictures and when I try to blow them up they lose resolution

Thanks in advance,

Bob

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Thursday, February 7th, 2019 AT 7:05 PM (Merged)

JAMES W.

MECHANIC
2,394 POSTS

The vacuum hoses for the damper control are usually bright colored plastic. Ie red, blue, black, etc. If you can't find a tube like this on the manifold, you may have to get to the back of the selector switch in the dash. Most common problem is loss of vacuum at the manifold or a bad selector control.
I'm in Minnesota, and heat is kinda' important up here. Hope this helps.

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Thursday, February 7th, 2019 AT 7:05 PM (Merged)

IMPALASS

MECHANIC
3,112 POSTS

Bob

Sorry for the delay. I was experiencing some minor technical difficulties

Thanks Mr Weizel for assisting. I have attached some more pics for better viewing. The one with the red circle shows that the vacuum comes in from the engine and connects to the HVAC Control Assembly Valve. As you make the selections the vacuum should be present but changes direction and causes the doors to move.

I have attached 4 more pics of the same thing blown up in 4 sections that overlap.

Hope this helps. Let us know if not.

Also please follow the advice of Mr Weizel. Most common problem is loss of vacuum at the manifold or a bad selector control

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Thursday, February 7th, 2019 AT 7:05 PM (Merged)

IMPALASS

MECHANIC
3,112 POSTS

Hello

One last thing

You may have some recalls on your vehicle. The dealer may fix these for free. Please contact the dealer service department, give them the VIN number of your car and have them check on these to see if they apply to you.