Dodge Repair Questions? Ask a Mechanic for Answers ASAP
It sounds more like the coolant isnt getting hot enough,,,after the engine is fully warmed up, feel both heater hoses, they should be to hot to hold onto with your bare hand.
If they are not very hot, replace the thermostat.
If you have further questions on this, please feel free to reply.
Check to see that the blend door is closing all the way,,,,thats what moves when you select from hot to cold.