I had the same problem, looking at the vehicle from the front,
under the hood on the left side at rear of hood is an assy that
is called AC regulator the harness can be pulled off the regulator
which can then be removed..etc... I part I needed was shorted out
the dealer had to order wiring harness and all thts the way it comes.. look at the device and see if there is any sign of burning or shorts.
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The problem is most likely the fan resistor it is located on the side or bottom of the heater box the heater box is usually located under the dash near the glove box look for an electrical plug going to a small plastic plate that is held in by two screws.
if you have checked the switch as recommended, it is most likely to be the heater resistor which contols the diffrerent speeds. it is
normally fited near to the motor and is a squarish block with multiplug on it and coils like springs in the centre of it, look at the coils they may be burnt out.hope this helps
You may need a GOOD new thermostat. I had the same problem twice on my first generation Dakota. The problem for me turned out to be the DODGE thermostat I used to replace the old Dodge part. I went and got a Stant from local auto parts store using the standard temperature spec and quit shivering the next time I drove it. I hope that helps!