I have yet to drop the heater control on my new car to inspect the sliders and the two pull switches. This isn't addressed in the standard Healey shop manual, so here goes. What switches on the fan motor? I attempted this while driving the car home from up north, and in addition to not being able to get the fan going, I concluded that the water cutoff (its little handle being missing) was probably shut off, as well. I know I need to get a better book, but I would appreciate help with this elementary issue. No, the car didn't come with an owner's manual.