2003 dodge caravan air vents will not change position?
I have a 2003 Dodge Caravan that blows both hot and cold air from the ac vents only. The switch/knob in the cabin that controls the vents (defrost, ac, floor, mixed) will move to different positions but nothing changes. The only vents that will work are the ac vents. Do you think the switch could be bad or something else? If so, could you please tell me the name of the switch and where to find information on replacing it?
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Have you checked the coolant level? What you describe is exactly what happens if the coolant level is low. When stopped at idle, hot coolant is not circulating through the heater core, so no heat. As the engine increases in rpm's when you pull away from the light, the water pump is spinning quicker, and some coolant is making it to the heater core. So check the level, and if it is low, keep an eye on it to see if it drops again. That of course indicates a leak somewhere. Get it fixed, as overheating the engine leads to costly repairs and worse case a new engine. Let me know how you make out with this.
There is a recall that has something to do with the air/heat system in 2005 Dodge Grand caravans. Recall F01. Here is a link. I had mine done two weeks ago, cost me nothing. My air conditioner was overheating.