Temperature blend door actuator location

Tiny
LEWISR5
  • MEMBER
  • 1997 GMC JIMMY
  • 3.4L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 175,000 MILES
Location of temperature blend door actuator for replacement. Thank you!
Monday, September 9th, 2019 AT 9:22 AM

6 Replies

Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I'm Danny.

There are two actuators (left and right mounted to the HVAC unit under the dash. Here is a tutorial showing how to replace:

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

I've attached a picture below of its location. Hope this helps and thanks for using 2CarPros.

Danny-
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Monday, September 9th, 2019 AT 12:04 PM
Tiny
LEWISR5
  • MEMBER
  • 6 POSTS
On my truck, there is only one actuator on it. It controls the temperature, hot or cold. Right now it is only blowing hot. Some called it the blend door actuator. Where is it located?
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Monday, September 9th, 2019 AT 3:00 PM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

There is an air temperature valve electric actuator located on the top right of the HVAC box. I've attached a picture below. On my previous response I included a blend door tutorial for you to view. Hope this helps and thanks again for using 2CarPros

Danny-
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Monday, September 9th, 2019 AT 8:16 PM
Tiny
LEWISR5
  • MEMBER
  • 6 POSTS
I took the dash and bottom of right side dash loose. Still no actuator. I am going to give you my VIN number and the correct name of the vehicle. It is a centaur. Have jimmy / half rv. 1gkdt13w9vk503721. Please help me.
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Wednesday, September 11th, 2019 AT 4:16 PM
Tiny
LEWISR5
  • MEMBER
  • 6 POSTS
Please tell me something
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Thursday, September 12th, 2019 AT 1:32 PM
Tiny
MASTERWRENCH
  • MECHANIC
  • 258 POSTS
Hello,

Looking at the information Danny provided, it appears the temperature door actuator is located on the TOP side of the HVAC plenum on the right side of the vehicle. Unfortunately the service manual indicates the dash must be removed to access it for replacement purposes. However, I would follow the diagnostic procedure listed below before removing the dash. This may save you some headache in the event the actuator isn't really the issue.
You should be able to get to the actuator connector without too much disassembly. The only other component you'll need to remove the is heater control panel. I've also included a copy of the wiring diagram referenced in the procedure. If you're not familiar with how to use a DVOM (Digital Volt Ohm Meter), I've also provided a link to a simple how-to tutorial.

https://www.2carpros.com/articles/how-to-use-a-voltmeter

1. Turn ignition on. Using DVOM, backprobe terminal "B" (Light Blue wire) of heater control module connector C2 to ground. Move temperature control knob from HOT setting to COLD setting, and then from cold setting to hot setting. If voltage varies between approximately 1-12 volts, go to step 3).

2. If voltage does not vary as indicated, check for poor connection at heater control module connector C2 (terminal "B") or short to ground/voltage in Light Blue wire. Also check for open Brown wire between heater control module connector C2 and fuse block. If connection and wires are okay, replace heater control module.

3. Using DVOM, backprobe temperature door motor terminal No. 10 (Brown wire) to ground. If battery voltage exists, go to next step. If voltage does not exist, repair open Brown wire between temperature door motor and fuse block.

4. Using DVOM, backprobe between temperature door motor terminal No. 7 (Black/White wire) and terminal No. 10 (Brown wire). If battery voltage exists, go to next step. If voltage does not exist, repair open Black/White wire.

5. Using DVOM, backprobe temperature door motor terminal No. 8 (Light Blue wire) to ground while moving temperature control knob. If voltage does not vary between approximately 1-12 volts, repair open Light Blue wire. If voltage varies between 1-12 volts, check for binding door or poor connections at temperature door motor. If okay, replace temperature door motor.
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Sunday, September 15th, 2019 AT 8:45 PM

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