Hi Haynes Team

I'm using manual #36024 and working on a 96 Ford Explorer XLT, 4 door, 4 wheel drive. My problem is the climate control only outputs high heat even when it is set to max cold.

My questions are: Is there a way to determine if the problem lies with the heater controls or with the blend door actuator? And do you have instructions for replacing the blend door actuator? I don't see them in Chapter 3 of the manual.