bcpaul

I have a 2006 Savana 3500. The heat control for the front only puts out full heat or full cold, but trying to adjust the **** anything in between does nothing.
Heat and AC works fine, just not able to adjust temperature.

Any ideas?

mountainmanjoe

that will be a malfunction in either the control panel, or the temperature blend door actuator.

bcpaul

Do you know how to diagnose which one it might be?

mountainmanjoe

are you good at electrical troubleshooting with a meter and reading diagrams?

bcpaul

Sure. I tested the variable resistor on the heater control ****.
25 ohms to 9200 ohms

mountainmanjoe

schematics and drawings are on charm.li
Next I would probably look at the actuator and door to see what they're doing when you twiddle the ****. It could be binding up or jumping teeth or something.