No heat from heater 1990 ZR1

[jrd1990zr1]

Originally Posted by QB93Z

John,


The Blend Door is controlled by a small electric motor and uses an electronic circuit to send position feed back to the AC Programmer. When the car is first turned ON, the AC Programmer sends a sequential full heat and full cool command to the Blend Door Motor. Since you are not seeing the movement, either the motor has failed, the AC Programmer has failed, there is a wiring problem, or the door is stuck.


I haven't investigated the access to the motor on a 1990 yet, but when you get to it, you can remove it and observe it's operation not connected to the door. And you can try to move the door by turning the pivot rod.


I have a complete set of the duct work from a 1991. I did not see it in the car so I don't know exactly how much you have to take apart to get to the motor.


If you need trouble shooting help when you get to the motor, call me. I will be glad to help.


Jim
443-244-1347

Hi Jim,

I don't want to waste your time with a long phone call until I get deeper into this. I pulled the glove compartment, other than the top of the duct work not much to see Photo 1.

Pulled the lower hush panel (Photo 2 and 3) and low and behold looks like someone was there before. Radio receiver and associated wiring is all hanging loose (Photo 4). I see the duct work and the SIR wire but nothing that looks like an actuator or motor. Am I looking in the wrong places or not far enough into this?
Thoughts?

Thanks, John