H2 HVAC Right SIde Temp Control
 

I have a 2003 H2. It has had the usual bugs with the HVAC. Over the years I have replaced the Blower Motor, Blower Motor Control Module, and three of the door actuators. My problem now is, that the passenger side Temp actuator on top of the dash is in the Hot position. It will do a cycle from hot to cold and back to hot when the H2 is started. I have replaced the actuator and still the same action. I have checked and all 4 of the inside temp probes are good. I swapped out the HVAC control module with another one and no changes. I have the shop manuals on the H2 and have read the HVAC trouble guides numerous times. Stumped!! Hate to carry to GM dealer and check with a Tech2 tool. May be only way out. Any thoughts on what might be problem. It's not the actuator.