Pretty hard to tell over a computer but I bet the fan isn't running. If it will run on just the highest speed, suspect a defective resistor assembly in the heater box. If it doesn't run on any speed, the fan motor is the most likely suspect but the switch could be bad too. The place to start is by measuring the voltages on the two wires to the fan motor.
Wednesday, February 2nd, 2011 AT 1:47 AM