- Check the fuses for the blower motor and the relay. Make sure that the fuses are not blown. Check the blower motor and the relay to be sure they have power. Start the car and with the circuit tester check across the fuse for power. Now remove the relay and make sure that there is power to two terminals in the relay's female terminals. With the heater turned on, put the relay back in slowly and listen for it to click, indicating that it was actuated. If it does not click and two terminals have power, replace the relay. Turn off the ignition.
- The blower motor is under the dash on the passenger side below the glove box and close to the right side kick panel. Remove the lower part of the dash under the glove compartment. There will be a blower motor resister located just to the left of the blower motor about an inch and to the rear. In response to the position of the fan control on the dash, the blower motor resister increases and decreases the voltage to the blower motor effectively changing the speeds of the blower motor.
- To check the blower motor resister and the blower motor, start the car and turn the fan on automatic. Check the blower motor at the two-wire connector by pulling it off of the motor and using the circuit tester check for power at one of the terminals. If it has power plug it back in and check the negative side for power. If it has power at the first terminal and power on the opposite side with the connector plugged in, proceed to the next paragraph. If not, do a final check on the blower motor. Use two jumper cables with alligator clips on the end for this next process. Unplug the electrical connector again at the blower motor and attach the alligator clip to the terminal that had power on the connector and to the terminal on the blower motor. Hook the alligator clip to the opposite terminal on the blower motor. Touch the free alligator clip to a good ground and see if the blower motor comes on. If it does proceed, move on to the next paragraph. If the blower motor does not come on, then the blower motor is definitely bad and needs to be replaced. If it is necessary to proceed to the next paragraph, let the car run.
- Check to see if there is power to the blower motor resister by removing the electrical connector to the resister. Probe the connector with the circuit tester and see if there is one hot wire in the connector. If there is, then you know that power is coming from the control head but no power is going to the blower motor, so the blower motor resister is bad and needs to be replaced. If there is no power to the resister and the fuse and relay were good, then the control panel on the dash is defective and needs to be replaced.
