What controls the heat
Could be a servo motor sticking for the temp control.
Or a resistor board. There' s a different resistance for each blower speed. When this board gives out, only certain speeds may work.
Definitely sounds like a resistor! Located next to the blower motor in the HVAC housing on the passenger side under the dash. Autozone part # CR153... $60.00..... may actual be cheaper going with OEM, call your local Dodge dealer.
Looking for a Used Ram 1500 in your area?
CarGurus has 11,152 nationwide Ram 1500 listings starting at $700.
Search Dodge Ram 1500 Questions
Dodge Ram 1500 Experts
Related Models For Sale
Used Cars For Sale