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