How to Test a Fan Motor With a Multimeter
How to Test a Mercedes Benz Sports fan Blower Motor Regulator
by Don Archer
Francois Durand/Getty Images News show/Getty Images
The Mercedes Benz fan blower motorial regulator is a series of resisters in a printed circuit board about 2-inches aboveboard located right next to the blower motor. The Mercedes has a series of sensors that, on the job in concert with a computer, assert a uninterrupted climate in response to the settings on the console. These sensors even sense when the window is down or the door is unfastened and step-up the fan speed as necessary to maintain a constant temperature inside the railroad car.
Step 1
Remove the passenger side, lower dash track subordinate the glove compartment that conceals the blower motor. A 1/4-inch socket will be needed to remove the screws holding the comprehend. Locate the cetacean motor. The motor can personify seen pendent close to the passenger kick panel. Just to the left of the blower motor, an electrical connector connected to a flat 1-inch-by-2-edge dental plate can be seen. This is the blower drive resister, which controls the fan speeds.
Step 2
Disconnect the multi-cable connection from the blower motor obstructionist next to the blower motor. Start the car and turn the air conditioning happening.
Tread 3
Test the connective for power at the terminals in the connector using the voltmeter. If there is power, reinstall the connector to the resister. If there is no force at the connector, there is a trouble with the console on the pall, and the comfort should be replaced.
Remove the wire connector that can live seen at the blower causative itself. Test this connexion for power. If there is power at this connector, the blower motor is at fault and needs to be replaced. If there no power is found, the electric fan motor resister is the culprit and needs to live replaced.
Tips
- As a line, 85 per centum of the time when the blower motor does not come happening Beaver State operates at one speed only, the blower motor resister is at fault. The resister emits substantial heat from the resistance it supplies and eventually burns up. The resister is inexpensive as parts live and is simple to replace. Barely disconnect the connexion and remove the two screws to supercede the resister.
- To test using the voltmeter, touch a good ground with the negative lead. Test each circuit aside touching the positive lead to the tour.
Things You'll Need
- ¼-edge drive ratchet
- Set of ¼-inch drive sockets
- Volt/Ohmmeter
Writer Bio
Wear Bowman has been writing for various websites and various online magazines since 2008. He has closely-held an auto service facility since 1982 and has over 45 years of technical get as a master ASE technical school. Bowman has a business degree from University of Pennsylvania Nation University and was an military officer in the U.S. Army (aircraft maintenance officer, pilot, six Air Medal awards, two tours Vietnam).
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How to Test a Fan Motor With a Multimeter
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