ive replaced the thermostat.flused the rad and the heater core and add new coolant
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1996 Dodge Ram 1500 Question: my heater only blows warm or cold air
Answer #1Bret Bodas from RepairPal Test Shop, November 17, 2009, 16:42Master
You may be having a problem with the temperature door. It directs airflow though/around the heater core. If the door is not operating properly you will never have warm air from the heater. I would check the fault codes in the A/C control system, and physically inspect the actuator for the door, make sure it is connected and moving when you turn it to full heat or cold.