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How to replace HVAC blend door actuator

Tiny
LUNDGREN
  • MEMBER
  • 2004 CADILLAC SEVILLE
  • 2WD
  • 80,000 MILES
Specifically, no air comes out dash or floor vents. If a bump is hit, then the air flow is correct and changeable. AC air is cool and heat air is hot.
Wednesday, October 12th, 2016 AT 2:21 PM

6 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
It is not the blend door that you are concerned with. It is the Mode door that you are diagnosing.

Here is a diagram of its location. Access may be a problem.

https://www.2carpros.com/images/external/105677782.gif
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Wednesday, October 12th, 2016 AT 3:46 PM
Tiny
LUNDGREN
  • MEMBER
  • 4 POSTS
Is the View from Drivers side? I removed the motor on the passenger side through the glove box, it looks similar. But it is not the one.

The motor changed position, how do you change it to match the valve/door?
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Wednesday, October 12th, 2016 AT 7:41 PM
Tiny
LUNDGREN
  • MEMBER
  • 4 POSTS
Thanks, very much for your help.
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Wednesday, October 12th, 2016 AT 7:41 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
You do not, it is self calibrating when the battery is disconnected.
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Wednesday, October 12th, 2016 AT 7:43 PM
Tiny
LUNDGREN
  • MEMBER
  • 4 POSTS
When it was disconnected from its shaft, the motor rotated to an impossible to mount position. It is about forty five degrees from being able to fit on the shaft. It must be rotated to be in the rotation range of the door shaft. How to make it turn If I put plus voltage, will it turn and not damage it?
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Thursday, October 13th, 2016 AT 11:41 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
You should not have turned the key on with the actuator removed. It relies on the door stops to calibrate.

Plug it in and try to change the temperature, but be ready to shut the key off quickly when it gets to the right position. It has to be installed to calibrate.
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Thursday, October 13th, 2016 AT 11:54 AM

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