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Old 06-19-2006, 08:16 AM   #16
JoshBarber
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Re: Blend Door (with pictures and the common problem)

OK, I didnt do a HOW TO with photos or anything, as I didnt have time when I installed the new motor, so I'll just give you a quick FYI on things to keep in mind. Refer to this photo for the following info.

REPLACING THE TEMP ACTUATOR ON A 98 CHEVY BLAZER 4X4



1. Disconnect battery cable.
2. Open glove compartment, and lift tab in upper left corner to allow the glovebox to swing down completely towards the passenger floorboard.
3. Gently remove the line that enters the "Vac Unit", and then the "Vac Unit" itself by wiggling it upwards off its mount. Once removed gently swing it towards the drivers side and out of your way.
4. You now have access to the Temp Actuator.
5. Carefully remove the electrical connector that feeds the Actuator.
6. Using a 1/4" drive wratchet, and 7/32" socket, remove the two (2) mounting screws. (HELPFUL HINT: For maximum ammount of clearance, Keep the wratchect handle facing the drivers side when putting it in place.)
7. There is no screw on the back mounting post, just a pin that holds it steady.
8. Once you've removed the screws you may need to gently pry the Actuator up off the blend door with a screwdriver.

Installation is reverse of the Removal. The Blend Door and Actuator are both keyed, so theres only one way to put it in. Guide the Actuator onto the Door, then re-secure the mounting screws.
__________________
doing a job? take digital pictures before and after!
helps you for reinstallation, and everyone else who will do the job later!
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Old 03-13-2007, 03:15 PM   #17
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Re: Blend Door (with pictures and the common problem)

I created account to thank y'all for this. I realize this is an old thread and I've not looked into it yet, but there is an access panel under hood labeled "Cut here for service" that was mentioned in another thread I had found, for which I do not have a link. I believe that is the easier way to get to that actuator. I'll post back for the archives this weekend.

Thanks again.
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Old 03-13-2007, 07:48 PM   #18
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Re: Blend Door (with pictures and the common problem)

The "cut here for service" you are referring to is for blower motor replacement. The blend door actuator is only accessible from under the instrument panel.
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Old 04-06-2007, 09:47 AM   #19
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Re: Blend Door (with pictures and the common problem)

Just wanted to add to the thanks on the best information I have found on this subject. I wish I had found this sooner since I dropped my Dash last night to get the motor out. Yep the gear was broken, and Oreilly's autoparts has it for $34.00.
This one thread was worth the time for signing up.
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Old 04-11-2007, 08:29 PM   #20
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Re: Blend Door (with pictures and the common problem)

Hey !
My 98 Blazer the actoator moter doesn`t stop . It moves back and forth without anything and in any outher slection ????
Help !!!
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Old 05-18-2007, 08:33 PM   #21
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Re: Blend Door (with pictures and the common problem)

I have a 96 S-10 and I was wondering, do I have to take out the entire dash to get to the blend door unit? it seems like the glove compartment is attached to the dash.
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Old 01-14-2008, 02:48 PM   #22
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Re: Blend Door (with pictures and the common problem)

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Old 03-19-2008, 01:08 PM   #23
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Re: Blend Door (with pictures and the common problem)

How did you get to the 2 screws on top of the blend motor? Is this the same as a 99GMC Jimmy? I dont recognise the pics even though I have all my dash panels off tring to get at this mistery motor. Please help
Thank you Dan 612-685-6586
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Old 05-30-2008, 08:06 PM   #24
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Re: Blend Door (with pictures and the common problem)

There are two more actuators to the left of the one discussed here. #19 and #17 on dealer print out. I have every bolt I can find out of my dash and still can't move that black plastic piece that is hidding the two acutators. Need help on getting to the actuator.
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Old 07-12-2008, 09:27 PM   #25
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Re: Blend Door (with pictures and the common problem)

Hi,
nice witeup in the works.
MY wife's 2000 Envoy has the same problem...blows hot air. A/C lines are cold.
My first suspect was the blend door actuater.
I replaced one on a Ford Windstar and what pita!!@!!!!!!!!!

Do you have more details on the swap/replacement procedure?
Thanks,
jonny
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Old 07-12-2008, 09:40 PM   #26
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Re: Blend Door (with pictures and the common problem)

Quote:
Originally Posted by jbag
Hi,
nice witeup in the works.
MY wife's 2000 Envoy has the same problem...blows hot air. A/C lines are cold.
My first suspect was the blend door actuater.
I replaced one on a Ford Windstar and what pita!!@!!!!!!!!!

Do you have more details on the swap/replacement procedure?
Thanks,
jonny
Sorry..never got to page 2.
Anyhow..is a 2000 envoy the same?
I guess I'll have to dig into it tomorrow.
Thanks again.
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Old 07-14-2008, 07:35 PM   #27
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Re: Blend Door (with pictures and the common problem)

Quote:
Originally Posted by JoshBarber
2. Open glove compartment, and lift tab in upper left corner to allow the glovebox to swing down completely towards the passenger floorboard.
3. Gently remove the line that enters the "Vac Unit", and then the "Vac Unit" itself by wiggling it upwards off its mount. Once removed gently swing it towards the drivers side and out of your way.
4. You now have access to the Temp Actuator.
5. Carefully remove the electrical connector that feeds the Actuator.
6. Using a 1/4" drive wratchet, and 7/32" socket, remove the two (2) mounting screws. (HELPFUL HINT: For maximum ammount of clearance, Keep the wratchect handle facing the drivers side when putting it in place.)
7. There is no screw on the back mounting post, just a pin that holds it steady.
8. Once you've removed the screws you may need to gently pry the Actuator up off the blend door with a screwdriver.

Installation is reverse of the Removal. The Blend Door and Actuator are both keyed, so theres only one way to put it in. Guide the Actuator onto the Door, then re-secure the mounting screws.
Thanks!!! Did just that..have part in hand and looks identical to yours..with crack in gear.
O'reilly can't pull up the auto one's price......nor is it available "on-line".

Junkyards or another cheap avenue now.
This was SIMPLE compared to the Windstar I did once!

Thanks for the write up...saved me hours!!
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Old 11-12-2008, 06:37 PM   #28
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Re: Blend Door (with pictures and the common problem)

First off thanks to everyone for the information. Hope someone can help with a quick question. on my wife's 2000 jimmy there are several vacuum actuators above the accelerator pedal with color coded vac hoses to them. They seem to function doors that direct the air to the different vents. One has a red and blue hose on the same actuator, another has a single yellow and one with a single black. I also found a brown vaccum hose that looks like it goes to one of the actuators but cannot find one with an unused nipple that it may have come off of. Anyone have any insight as to where it may belong?

second question, The problem I'm trying to fix is that the air blows neither cold nor hot air but just luke warm. Pep boys diagnosed it as a blend door issue, but most people on the forums complain of either really hot or really cold air all the time. Is there only one blend door? and if so is there a position in which it may be stuck that would blow room temp air only? (when set to heat or A/C)

Thanks in advance.
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Old 12-02-2008, 01:37 AM   #29
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Re: Blend Door (with pictures and the common problem)

I have the problem with no heat and the temp of the air never changes. I have the 2001 blazer with the trailblazer package. I have replaced blower motor and thermostat and heater core and all is brand new. I have checked fuses and nothing. I am hoping this is the key to keep me from freezing is there anyway just to make the air hot all the time instead of just buying the new part. If soo please let me know if I can do a quick fix or if ill be stuck paying to replace this over priced piece.
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Old 12-28-2008, 09:03 PM   #30
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Re: Blend Door (with pictures and the common problem)

I too need to replace the temp actuator motor on a 96 s10 and as notsmartguy states above, access behind the glove box is blocked by the dash (no opening). Has anyone changed a 96? Does the entire dash need to be removed or is there another way??
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