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Old 03-24-2019, 07:27 AM   #1 (permalink)
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GMT-800 Blend Door issue

GMT-800 (2004 Suburban) blend door issues.

Initially, would not direct the air to the floor, but that was the only problem.

Now, while that issue persists, only cold air is available from the dash vents or defroster.

The rear seat system gets heat.

Heading to Vermont so wondering if there is a way to address without ripping the dash out. All I really care about is heat for defrost, I can live without the rest of it for now.

Have seen conflicting information on line - blend doer motors easily accessible behind the radio or glove compartment, or rip the shit completely out.

Thanks in advance.
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Old 03-24-2019, 07:43 AM   #2 (permalink)
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Rip it all out.

I just did a blend door motor heat/cold on an 02 Silverado. It was at the bottom middle with 2 7/32" head screws.
Make sure the actuator is centered, do not plug in to do this, or plug in the check operation. Out of the box centered is the best, but if it needs to be manually done, take the cover off the actuator, slide the motor out, and adjust the geared assembly.
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Old 03-24-2019, 07:50 AM   #3 (permalink)
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Originally Posted by NOODLES View Post
Rip it all out.

I just did a blend door motor heat/cold on an 02 Silverado. It was at the bottom middle with 2 7/32" head screws.
Make sure the actuator is centered, do not plug in to do this, or plug in the check operation. Out of the box centered is the best, but if it needs to be manually done, take the cover off the actuator, slide the motor out, and adjust the geared assembly.
Great. Is there a way to poke in from somewhere with a hook to pull the flap over?
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Old 03-24-2019, 08:17 AM   #4 (permalink)
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If it is single zone HVAC the temp motor is stupid easy on them. 10 minutes and it is done.
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Old 03-24-2019, 09:14 AM   #5 (permalink)
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If it is single zone HVAC the temp motor is stupid easy on them. 10 minutes and it is done.
It is a single zone. Where is this motor of which you speak?
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Old 03-24-2019, 09:26 AM   #6 (permalink)
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I wouldn't worry about heat. Temps have been in the 30s to 40 with 50s coming in next week.I have been working outside today in just a tee shirt. You won't need your heat.
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Old 03-24-2019, 09:33 AM   #7 (permalink)
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Does one motor control the direction of the air and a different motor control the temp of the air?
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Old 03-24-2019, 10:25 AM   #8 (permalink)
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Does one motor control the direction of the air and a different motor control the temp of the air?
Yes. Temp motor is bolted to the bottom of the case just to the passenger side of the dash. The mode motor is bolted to the drivers side of the case above the accelerator pedal.
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Old 03-24-2019, 11:45 AM   #9 (permalink)
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Yes. Temp motor is bolted to the bottom of the case just to the passenger side of the dash. The mode motor is bolted to the drivers side of the case above the accelerator pedal.
So then both are accessible without ripping out all the shit? I don't see how I can fit my hands up in that tiny space above the gas pedal.
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Last edited by plym49; 03-24-2019 at 11:50 AM.
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Old 03-24-2019, 11:52 AM   #10 (permalink)
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So then both are accessible without ripping out all the shit?
No, you start by removing the passenger rear tire. Its an odd process.
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Old 03-24-2019, 11:56 AM   #11 (permalink)
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No, you start by removing the passenger rear tire. Its an odd process.
Hey, it's not a Land Rover.
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Old 03-24-2019, 12:15 PM   #12 (permalink)
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I have to replace my actuators also. Froggy is a little slow but this should help you
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Old 03-24-2019, 12:19 PM   #13 (permalink)
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The knob that the actuator slides over can be moved by hand. At least the temperature blend door can.
It is easier if the fan is not running when you try and do this.
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Old 03-24-2019, 12:25 PM   #14 (permalink)
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So then both are accessible without ripping out all the shit? I don't see how I can fit my hands up in that tiny space above the gas pedal.
Some 800's have a cover that runs from pass to drivers side toe kick area you have to pull off first. 7/32" head screws iirc. Once that's off it should be easy.
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Old 03-24-2019, 02:23 PM   #15 (permalink)
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I wouldn't worry about heat... Blah... Blah.... Blah....You won't need your heat.
Hey n00b !! We need it to rid of the morning dew/fogged up moisture-
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Old 03-24-2019, 02:57 PM   #16 (permalink)
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I wouldn't worry about heat. Temps have been in the 30s to 40 with 50s coming in next week.I have been working outside today in just a tee shirt. You won't need your heat.
Best news yet.
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Old 03-24-2019, 03:10 PM   #17 (permalink)
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I have to replace my actuators also. Froggy is a little slow but this should help you https://www.youtube.com/watch?v=pgadjXyqjbA
Holy crap, slow is not the word. Plus, referring to himself in the third person. What a maroon. Thanks for posting, though, if my 2004 is the same I should be able to swap out both blend and mode actuators.
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Old 03-24-2019, 04:02 PM   #18 (permalink)
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Hey n00b !! We need it to rid of the morning dew/fogged up moisture-
Sorry, I forgot you new yucker don't have the common sense to open a window to clear the fog from all that hot air you blow.
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