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

[Kneale Brownson]

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.