Blend Door Location
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Author Topic: Blend Door Location  (Read 279 times)
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pearlheartgtr
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« on: October 22, 2017, 03:42:15 AM »

I think my blend door is done for. I went to use my defrosters tonight when I left work but the hot air was blowing out everywhere but from the defroster vents.

I want to have a look at the blend door and need to know where it is. Anyone know?

Thanks!
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BlueGT
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Mermaid with an Aztek


« Reply #1 on: October 26, 2017, 12:00:34 AM »

More than likely it's the actuator. It's on the driver's side in the middle of the dash. You will need to remove the lower dash trim pieces under the steering column to access it.

On mine, the actuator is okay but the rods and levers are borked, I need to replace all that hoping the dual zone is the same as base or find a Rendezvous with DZ.
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2001 Steel Blue Metallic GT 1 of 1956 FWD blue GTs.
pearlheartgtr
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« Reply #2 on: October 26, 2017, 12:32:24 AM »

Yeah, I found it the other day. The actuator had blown something in it. When I took it apart there was a burn mark on the circuit board and the board was a little bowed. I think it blew a resistor. But, if it were one of the other actuators where the big gear tends to break, someone made a gear for 3D printing (it's the same gear sold on Amazon as the rebuild kit--which is also 3D printed rather poorly). I had printed it up with hopes it was just the gear, but this particular actuator doesn't have it.

It was a job and a half getting the old one out since it's behind a metal plate (I couldn't figure out how to get that thing away). I just hope it's a hell of a lot easier when the new one goes in.

For anyone else needing to do this job, here's a few things I found that I hope will help.

I was able to find the actuator from this video for a Pontiac Montana/Chevy Venture. The guy also goes through and shows you which one does what:
https://youtu.be/VBZMdPKrgNs

Here's the gear if anyone wants to print one up:
https://www.thingiverse.com/thing:2166873

I'm also attaching the repair/install instructions from the GM Service CD.
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pearlheartgtr
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« Reply #3 on: October 26, 2017, 03:18:54 PM »

I'm going to keep updating this post so that it may help someone else out in the future.

1. I accidentally bought ACDELCO 1572650 instead of DORMAN 604117. The levers were different, but I was able to swap them, no problem. The Delco part is for the actuator on the passenger side and the Dorman for the driver's side. This actuator (for the modes: face, feet, defroster) is located up behind the steel bracket in the front. Just watch the video I posted. It's exactly where the one in the Venture/Montana is, but being an Aztek, nothing can be easy.

2. This was a b***h and a half to install. I would not wish this upon anyone. If I ever have to do it again, the dash is coming out. That would probably result in less aggravation and four letter words.

3. See #1. Not just the levers were different, but the wires, too! Hooray! When I turned on the car, the mode for face vent opened the defroster, and the defroster mode opened the face vents. No biggie. I can live with that. I would like to find a schematic for the mode control dial plug to make life a bit easier to repin those wires, but I am probably going to have to sit down with a multimeter and whittle down which terminals activate when I turn the dial. I could get the right part and reinstall, but... See #2, not in my lifetime.
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