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It is most likely a bad blend door motor. Try tapping on the floor vents where heat comes out at your feet on the passenger side. And the top of dash in the middle to passenger side.
I'd lean more toward the blend door actuator. I've experienced that problem more often with Grand Caravans (aka Town and Countries) and Pacificas. Usually, if it's a resistor, it's the blower motor resister, which means you wouldn't get any air movement at all.
The only thing I can't recall off hand is if Chrysler services the actuator separate from the blend door housing on these models. However, I'm sure that's what you will need as the blend door is what regulates the mixture of cool and hot air. Keep in mind this is not the mode door actuator or housing. That's something completely different that directs the air to different paths (vent, floor defroster, etc.)
Contact Chrysler as I believe these are only available OEM last I checked.
First check the coolant level. If that is ok, then start the van and let it get up to temp. Inspect the passenger side front floor and carpet. You may need to peel back the carpet a bit front the front. Youre looking for coolant coming into the vehicle which is a sign your heater core has failed.
Im assuming it is an engine that uses a timing belt. It sounds like the belt has jumped 1 tooth. if it only jumped 1 tooth than the computer will compesate the timing so it is possible the sensors will say they are ok. If it is a motor that uses a chain than it problaly needs a new gear/chain set.
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