Medium and Heavy Trucks
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Hi Greg, my name is***** will be glad to try to help. Access the blend door and see if either something got lodged into the blend door and heater box through the vents or if the door linkage, etc are still in tact and have not broken. If okay monitor the blend door movement to see if the actuator is actually responding properly when moving the controls confirming a faulty actuator. Let me know
Let me see what I have for some information to help with accessing your blend doors and heater box to help more
Understood. Let me see what I have for breakdowns for that heater box. Click this link for a picture of what the actuator looks like. This is for reference. It may or may not be the correct replacement part number for your truck
I know on some of the models it is tight but you can reach and replace the actuator from underneath the dash and pulling some of the dash panels to access the heater box. The actuator as seen will be mounted to the box.