Quick Blower Motor Test
Suppose you have a blower motor that has quit blowing. The culprit can be anything from a blown fuse, to a bad switch, burnt resistor, wiring, or the blower motor itself.
Before you get out your test light and volt meter, try this simple little tip. It works about 75 percent of the time and can potentially save you some labor.
Verify the bower motor is not working on any speed. If the motor works on high speed but none of the others, you've pretty much verified the motor is O.K. Check the blower resistor instead. If the blower is inoperative in all speeds, you can proceed with the quick blower motor test.
1. Locate the blower motor. It's usually tucked away under the passenger side of the dash. Look directly above the area where the passenger's feet would be. If passenger is in this area, remove passenger first. You may also have to remove plastic sound insulator panels to access this area. These panels are usually held in place with small push pins, screws or clips. 7 mm head screws are most common. It would be a good idea to have a flashlight handy. Note: Not all blower motors are located here. See your service manual for specific details.
2. Turn ignition to the run position. It's usually not necessary to start the engine. Placing the key is in the run position is usually enough to energize the blower motor circuit. By not starting the engine we might be able to hear any sounds that come from the blower motor better.
3. Turn the blower switch to high speed. And be sure the mode is set to a position where the blower will operate.
4. Lightly tap on the blower motor. Don't go crazy and break anything. Just give the back of the motor some small raps with a light mallet or clenched hand. That's usually enough to get that stuck motor spinning again. If it starts spinning again you should plan on replacing the blower motor and blower resistor.