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When I tested the CCU I didn't run the diagnostics at every temperature, just at each mark on the dial which corresponds to about 2-3 degrees difference between test points. Was this OK?So if I disconnect the cable, I should be able to manually move the heater core valve... without much risk of damaging anything? Is this valve controlled by the air mix control motor or does that control a damper... or both? If the valve is frozen in position due to lack of use, would that explain lack of any codes for either the motor or temp sensor? I still don't see why both heater hose lines would be warm to the touch. If anything it appears that the valve is stuck open since the outlet hose is warm.
When I tested the CCU I didn't run the diagnostics at every temperature, just at each mark on the dial which corresponds to about 2-3 degrees difference between test points. Was this OK?
So if I disconnect the cable, I should be able to manually move the heater core valve... without much risk of damaging anything? Is this valve controlled by the air mix control motor or does that control a damper... or both? If the valve is frozen in position due to lack of use, would that explain lack of any codes for either the motor or temp sensor? I still don't see why both heater hose lines would be warm to the touch. If anything it appears that the valve is stuck open since the outlet hose is warm.
