I know its not a contour but the system should be the same just different components. The problem is with my mothers 98 explorer. The air from the system is always cold. I changed the thermostat as this is the easiest first step. Since that did not work I dug deeper. The vaccum valve under the hood for the heater core opens as it should. The vaccum valve behind the glove box for the ac opens and closes as it should. I disconnected the harness from the top of the plenum behind the golve box and checked the resistance from the temp switch. I get a increase and decrease in resistance as you would expect from the switch.(although not sure what the range should be).I a thinking that there must be some type of blending valve( not sure if that is the term) in the plenum to blend hot air and ambient air. Could this be the most likely cause. If someone with thoughtful insight could chime in I would be most grateful. I live in Maine and this is starting to become an issue. Sorry for the long post but I'm stuck. TIA Rob C
