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Old 06-04-2006, 09:30 PM   #1
riccbhard
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Blend Door (with pictures and the common problem)

A common problem is to find one day when moving the climate control knob on your 98 Blazer to the cold position and tap the A/C button you get still hot air and hear a *creak* *pop* from under the dash. So now what? Well, chances are it's the blend door motor, the unit that moves a blending door in a duct behind the dash on the passenger side that moves anywhere between cold and hot, corresponding with your temperature knob.

We were able to get the one in our 98 Blazer out by dropping open the glovebox and using some small tools.


Pictures:

Picture 1, the electronic blend door motor


Picture 2, the blend door taken apart, by removing the 4 small screws


Picture 3, The Problem, the broken gear.



Why the gear breaks I am not sure. The door itself does not seem hard to move.

More to come later, such as pictures of where it is located.

Currently, the blend door itself in the Blazer is tied to the cool position so the A/C works.
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Old 06-05-2006, 01:06 AM   #2
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Re: Blend Door (with pictures and the common problem)

Good stuff
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Old 06-05-2006, 06:05 PM   #3
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Re: Blend Door (with pictures and the common problem)

the reason it breaks is becouse of the material it is made out of, Tephlon is not very durable. I had to replace mine not too long ago, I tried doing the quick fixs and even went to a bone yard to get a used one and that was a flop too, I ended up going to a dealer and spending about 200 bones for it, I checked the numbers and asked why they were different. the dealer called the manufacturer and they said the numbers were different becouse the part was an upgrade, the gear is supposed to be made out of aluminume now. Ive been happpy so far. oh by the way, good post, and if the moderators want they can combine my post on this issue with this one....
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Old 06-05-2006, 08:09 PM   #4
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Re: Blend Door (with pictures and the common problem)

Is this the same motor used in the automatic temp control?
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Old 06-05-2006, 08:21 PM   #5
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Re: Blend Door (with pictures and the common problem)

Nice write up, thanks.
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Old 06-05-2006, 09:29 PM   #6
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Re: Blend Door (with pictures and the common problem)

Quote:
Originally Posted by muzzy1maniac
Is this the same motor used in the automatic temp control?
Yes, this came out of our 98 Blazer that has an automatic temp. control.
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Old 06-06-2006, 09:37 AM   #7
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Thumbs up Re: Blend Door (with pictures and the common problem)

KILLER WRITEUP DUDE! WITH PIX!

I've been suffering with this issue for a while. Did you replace the full motor or just the gear?
What small tools you used to get to it? It's VERY difficult to reach the three mounting screws.

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Last edited by JoshBarber; 06-06-2006 at 04:22 PM.
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Old 06-06-2006, 04:18 PM   #8
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Re: Blend Door (with pictures and the common problem)

Quote:
Originally Posted by JoshBarber
KILLER WRITEUP DUDE! WITH PIX!

I've been suffering with this issue for a while. Did you replace the full motor or just the gear? And where did you order it from? Cost?
Could you give me the details on the part number for the new motor, and what small tools you used to get to it? It's VERY difficult to reach the three mounting screws.

What view is this?
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Old 06-06-2006, 04:18 PM   #9
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Re: Blend Door (with pictures and the common problem)

Ok, I just ordered the new blend door motor for the AUTO Climate Control on my 98 Blazer LT. They call the part out as an "ACTUATOR", and it appears as #4 in GM's exploded view.

The new P/N is 89018365

The dealer priced is at approx $180, I got mine from GMPartsDirect.com for:

SUB TOTAL: $97.58
SHIPPING: $21.47
TAX: $0.00
TOTAL WITH TAXES: $ 119.05
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Old 06-06-2006, 04:21 PM   #10
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Re: what view is this?

Eye level looking through the glove compartment area with the glove compartment flipped open and down out of the way.
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Old 06-06-2006, 04:58 PM   #11
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Re: Blend Door (with pictures and the common problem)

I may have to do this, I am having the same issues.
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Old 06-14-2006, 10:34 AM   #12
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Re: Blend Door (with pictures and the common problem)

SHIT! I bought my replacement motor, but I'm still having the problem. I have NO movement whatsoever in the motor at this time. Not in the old or new motor. I've checked fuse number 21 in the fuse block on the drivers side dash, and the HVAC fuse under the hood. I'm stumped. What's the problem? Anyone?

Below is the schematic....any help would be GREATLY appreciated. Otherwise I may end up paying the dreaded RIPOFF $90 Diagnostic fee.

http://i16.photobucket.com/albums/b4...zer_Page_1.jpg
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Old 06-14-2006, 12:00 PM   #13
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Re: Blend Door (with pictures and the common problem)

GM PARTS DIRECT sent me the WRONG DAMN PART! They sent me the actuator for the Manual not the AUTO! No wonder it's not moving, it doesnt have the correct number of pins to receive power!

Auto part:

-------------------------------------------------------------------
Manual part:

as you can see it's a different pin setup from the part shown above.
-------------------------------------------------------------------

I called GMPartsDirect, but its all automated. Best you can do is leave a message. I'm so pissed off!
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Last edited by JoshBarber; 06-14-2006 at 12:43 PM.
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Old 06-15-2006, 09:26 AM   #14
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Re: Blend Door (with pictures and the common problem)

Well, I've been in touch with GMPartsDirect by phone, and they've shipped me the correct part. They admitted to their mistake, and are going out of their way to make up for it. Very promising! The correct part is on the way and should be here today or tomorrow. I will post a HOW TO with photos on the replacement.
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Old 06-15-2006, 05:30 PM   #15
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Re: Blend Door (with pictures and the common problem)

If you have a volt/meter and a schematic with a little patience, (which I lack alot off) i am sure you can figure it out. as for the dif pin setups, you got the wrong part, the dealer part will have most of the original part numbers with a few that are diffferent. looks like you got one for a 2000 model. its got to be a R series.
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