The heater blower motor is located behind the glove compartment of your vehicle. Basic instructions on how to troubleshoot the heater blower motor of a Saturn S-series. The radiator fan should be running at more RPMs than the motor. ... To test the evaporator fan motor in your freezer, open the door and feel for cold air. Both fan motors do not run in low speed when the low speed radiator fan relay is bypassed (TEST 3). ... you can test it with a digital multimeter. A simple test of the radiator coolant for conductivity will tell the story. Locate the door switch thatâs pressed when the door is closed. Check the fuse and replace if necessary. If your fans ran as they should, this confirms that each fan motor is working and the wiring from the relays to the fans is good and the Radiator Fan Main Relay is at least partially working. Besides the battery radiator fan test, you can also test the connector voltage. Disconnect the negative and positive power supply. This time both fans should run. Place the leads of the ohm meter on the wires that run from the capacitor to the motor. How to Test the Cooling Fan Motor. To test the radiator fan motor itself, see this tutorial: Radiator Fan Motor Test (2001-2005 1.7L Honda Civic). The only thing you can check is that youâve got the proper line voltage with a heavy load, such as the humming motor, connected. Here is how to tell if radiator fan is working using a digital multimeter. Repeat this test using the White and Pink wires of the Condenser Fan Relay. Some manual radiator fans have a fan clutch. If the fuse is blown, this is usually due to the fact that the radiator fan motor is bad. If your freezer isnât as cold as it should be, there might be a problem with your evaporator fan motor. If it is not, the fan ⦠Using a multimeter set on the Ohm scale, use the positive lead and test the black wire. If your radiator fan has a fan clutch, check the radiator fan while the motor is running. Look for movement of the needle on the meter toward infinite ohms. You _might_ be able to detect this failure with a modest multimeter, but don't count on it. Since the motor is turning freely, it wonât do any good to lubricate the bearings and since the capacitor checks out and the motor is humming, it means youâve got voltage to the terminals. If the meter doesn't move toward infinite ohms, the capacitor is bad. CASE 2: Your multimeter DID NOT register 10 to 12 Volts. Perform a quick diagnostic test for corrosion in your water pump, radiator or heater core with a digital multimeter. Use a multimeter to check the electrical resistance of the motor. Count to three while the leads on the meter charge the capacitor. to the motor frame. Ground is present in terminal #1 (this test section). The insulation may only break down near operating voltage. Anything other then an open circuit indicates such a failure. If the fan fails to come on, you still can check the fan by connecting direct battery power to it (while working and making tests in the proximity of the fan, always stay clear and keep tools away from the fan). With the fan out of the circuit (!!) Sensors Coolant Sensors measure the resistance between the winding (any terminal) and the motor frame. How to test radiator fan with multimeter. Power is present in terminal #3 when the low speed radiator fan relay is bypassed (TEST 5). Unplug the fan connector and identify the terminals using your car manual; Set the multimeter to measure voltage Reverse the leads on the capacitor. CASE 3: The multimeter DID NOT register 12 Volts for circuit #3. A reading of .4 volts or less means the coolant is good. (The black wire is usually the negative.) The fan clutch has a spring inside of it to help the fan spin faster. Such a failure corrosion in your water pump, radiator or heater core with a modest multimeter, but n't... 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