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Blend door actuator not working

Tiny
PCULQUI
  • MEMBER
  • 1999 BUICK REGAL
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
I just recently replaced my broken blend door actuator. One of the disks inside was cracked. Installed the new one and it still doesn't work. Open it up but there are no disks broken. It could be the small motor inside the unit but I don't have a electrical tester for it. Or it could be a fuse. Now, if it is a fuse or relay, how do I know what to look for.
Now, my vehicle has separate driver and passenger HVAC controls. The passenger side works well when switching from cold to hot. But I noticed that the 'passenger control's don't work for the passenger side. The main(drivers side) controls do. Could it be that the lines are crossed and when I fix the problem with the blend door actuator the 'passenger controls will work for the drivers side?
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Tuesday, September 24th, 2019 AT 3:26 AM

17 Replies

Tiny
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Good morning,

This sounds like an issue with the control panel itself. The signal from the panel is what makes the blend doors work. You will need to check the connector at the blend door motor for a signal with a voltmeter to see if the control head is sending a signal.

There is not a fuse or relay in this circuit.

I attached a wiring diagram for you to view. Verify you have power to the actuator. You need 6 volts to the motor.

Most likely this is going to be a control head but needs to be confirmed by checking for signals.

Roy

1. Disconnect the negative battery cable.
2. Remove the instrument panel accessory trim plate.
3. Remove the front floor console if equipped.
4. Remove the HVAC control assembly mounting bolts.
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Tuesday, September 24th, 2019 AT 5:05 AM
Tiny
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In the fuse box, what is the low blower and high blower fuse for.
I was trying to remove the panel surrounding the HVAC head unit but its not budging. I see the clips have come out but it is still hard to pull out. If you can send me a diagram of everything I need to pull out. Maybe I'm missing by a screw or a clip. Thanks.
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Tuesday, September 24th, 2019 AT 7:32 AM
Tiny
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They are blower motor fuses.

Attached is the picture. There are 2 screws that hold the trim plate.

Roy
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Tuesday, September 24th, 2019 AT 7:55 AM
Tiny
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This is not my model. My Buick Regal LS 1999 has the panel that runs all the way to the floor and attaches to the shifter. There are 2 screws behind the unit by where the gas/brake pedals are one on the left and one on the right.
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Tuesday, September 24th, 2019 AT 9:04 AM
Tiny
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Can you give me a picture of the control panel? I see the shifter cover off.

Roy
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Tuesday, September 24th, 2019 AT 9:16 AM
Tiny
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The second and third pictures are from the sides of the panel.
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Tuesday, September 24th, 2019 AT 9:29 AM
Tiny
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There are bolts on either side but the panel for your model the console has to be removed. Then you will have access to the control head.

Roy
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Tuesday, September 24th, 2019 AT 9:44 AM
Tiny
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In your diagram, I don't see the shifter, does the shifter need to be removed also?
So after removing those 4 bolts inside the panel as in your diagram, it's one whole piece that comes out.
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Tuesday, September 24th, 2019 AT 9:51 AM
Tiny
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The console will come up without removing the shifter itself. The shifter will remain.

Roy
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Tuesday, September 24th, 2019 AT 10:21 AM
Tiny
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So the reason I couldn't remove before is because I never removed those 4 screws pictured in your diagram. When I remove those 4 screws, do I have to take those metal brackets out or just leave them in there?
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Tuesday, September 24th, 2019 AT 10:30 AM
Tiny
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You can leave it there. There are 2 bolts to the bracket from the console. The other 2 just hold the bracket to the floor.

Roy
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Tuesday, September 24th, 2019 AT 10:33 AM
Tiny
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Oh, so I don't need to take the ground bolts out and the console will just pull out.
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Tuesday, September 24th, 2019 AT 10:49 AM
Tiny
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That is correct.

Roy
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Tuesday, September 24th, 2019 AT 10:52 AM
Tiny
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You wouldn't know the model number of this climate control unit?
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Tuesday, September 24th, 2019 AT 11:08 AM
Tiny
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No, a parts department would have that information.

Roy
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Tuesday, September 24th, 2019 AT 12:00 PM
Tiny
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Okay. Thank you for all that info. I would not have figured it out myself.
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Tuesday, September 24th, 2019 AT 12:20 PM
Tiny
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You are welcome.

Always glad to help.

Roy
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Tuesday, September 24th, 2019 AT 12:26 PM

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