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