1990 Blend door question
Thread Starter
2nd Gear
Joined: May 2021
Posts: 2
Likes: 0
1990 Blend door question
Hi, I have a 1990 convertible and for those unfortunate to have worked on their heater core or blend door I have a question.
My blend door does not work correctly. I have rebuilt the programmer, controller and one new blend door motor. What happens is, when you turn on the key, the blend door actuator goes through its calibration, it is supposed to open the door all the way and then close it all the way. It starts the calibration, but the actuator motor continues moving in one direction and gets out of sync. I think the blend door is loose on the shaft that is turning. With the actuator installed, I can push the door in either direction with a screw driver from under the hood by removing the speed control heat sink. It has some resistance, but not a lot.
Should this door be very tight on the shaft or will it move some if pushed?
Thanks for any help.
My blend door does not work correctly. I have rebuilt the programmer, controller and one new blend door motor. What happens is, when you turn on the key, the blend door actuator goes through its calibration, it is supposed to open the door all the way and then close it all the way. It starts the calibration, but the actuator motor continues moving in one direction and gets out of sync. I think the blend door is loose on the shaft that is turning. With the actuator installed, I can push the door in either direction with a screw driver from under the hood by removing the speed control heat sink. It has some resistance, but not a lot.
Should this door be very tight on the shaft or will it move some if pushed?
Thanks for any help.
Thread Starter
2nd Gear
Joined: May 2021
Posts: 2
Likes: 0
Thanks for any help!
Instructor
Joined: Jan 2013
Posts: 128
Likes: 26
It was a few years ago.. as I remember, it's a plastic part that connects the motor and the blend door and it had two faults, a very small crack and it was very worn. I think it was like a collar with slots. Just lightly pressed on the blend door shaft, easily removed once you have the heater box off. I made mine just slightly tighter than the original; the blend door movement still wasn't 'solid' but it didn't swing wildly making "thunk" noises anymore.
Unfortunately a hard drive failure wiped the photos and files.
Unfortunately a hard drive failure wiped the photos and files.
Last edited by frosted; May 25, 2021 at 12:52 PM.
