[V8] Heat related issues....GM climate control silliness....

[Dave Saad]

There is a tiny potentiometer that is used by the controller to determine the flap position. Maybe you can clean it up and verify the output voltage changes smoothly as the arm moves?
This is the feedback that the control head relies on.

Dave
Sent from my iPhone

> On Dec 12, 2013, at 6:44 AM, Kneale Brownson <kneale at knitknacks.com> wrote:
> 
> I've had to replace two or three of the temperature control motors on 200q20vs.  They either get so they won't hold a temperature or they get so they just won't change the flaps.  If dim memories serve me, the V8s use the same motor, which is mounted to the heater core box.  There's a description and the motor part number in this bit from Chris Miller's old 200q20v pages: http://web.archive.org/web/20070222145728/http://members.aol.com/c1j1miller/climate.html#Temperature regulating flap <http://web.archive.org/web/20070222145728/http://members.aol.com/c1j1miller/climate.html#Temperature%20regulating%20flap>
> 
> The plastic linkages the motors move to change the flaps become quite brittle with age,  so they need to be treated gently.
> <http://web.archive.org/web/20070222145728/http://members.aol.com/c1j1miller/climate.html#Temperature%20regulating%20flap> 
>> On 12/12/2013 6:02 AM, Ted Haug wrote:
>> More questions for the collective experts.
>> 
>> Well the saga continues in my quest to restore a more temperate environment in the cabin of the V8.  Here's a run down on what we know, and what I think the problem might be:
>> 
>> Heater is clean, good flow.  Thermostat is replaced and works perfectly, car comes up to operating temperature quite nicely.  What doesn't work:  the blend door motor/actuator is not moving the flaps to direct the air flow across the heater core.
> 
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