how to test a radiator fan motor with a multimeter

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

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