How to Troubleshoot a Blower Fan Not Working
by Troy Lambert
Digital Multimeter image by TekinT from Fotolia.com
To see the cause of a cetacean fan loser, keep apart the motor, and do some basic electrical tests. Bring broad knowledge of electricity and specific knowledge of the use of physical phenomenon testing equipment. A wiring plot for the specific vehicle is also helpful. Keep an eye o prophylactic precautions while working with electricity.
Follow the Magnate
Step 1
Check fuses first. Fuse failure often causes component bankruptcy. Replace fuse if blown; if not, proceed to Step 2.
Step 2
Check for mightiness at the causative itself. Using a test light or a multimeter set on volts, unplug the blower motor. Retention the graphite on a good ground, ordinarily a bolt happening the cylinder block, and the blower trade randy, expend the red atomic number 82 to probe the plug that unremarkably attaches to the blower causative. The time should read between 9 and 11 volts or the test light will light up. If the voltage is right surgery the mental test light illuminates, extend to to Step 3. If not, skip to Step out 4.
Pace 3
Test the connection to the blower centrifugal. Take two jumper leads, ace black and peerless red. Connect the graphite to a ground and and then to the cetacean motor assembly. Connect the crimson lead to a power source and then to the leads happening the centrifugal side of the divided connection. If the motor turns, the connector is bad. Renovate the connector. If the motor still does not sprain, the motor is bad. Replace the drive.
Test the switch. Plug the connector backwards in to the cetacean mammal motor, and then trace the conducting wire harness backmost to the connector closest to the blower motor permutation, usually located under the dash. Disconnect the connector and Set the multimeter to ohms. Place incomparable lead on one prong of the connexion and the other lead happening the power in prong of the connector, attractive maintenance that they practice not touch each other. If you turn the switch connected, you should get a recitation between .01 and .03 ohms. A slightly high reading is acceptable because switches vary in resistance. If you get no reading on any of the exchange settings, the switch is bad. Replace it.
Going Deeper
Step 1
Test to ascertain if the switch is getting power from the barrage fire. Leaving the switch disconnected, tack the multimeter to volts again, surgery enjoyment a test light. Grounding the mordant result as before, use the red lead to probe the connector. Usually a Green River or red wire will be the hot, or power, wire. Consult the wiring diagram for the peculiar vehicle if the cable color is chartless. If the meter shows the adjust voltage, or the test lightly illuminates, the switch is acquiring power, skitter to Step 3. If IT does not, proceed to Step 2.
Step 2
Attend for a cut in the wiring harness if the examine light does not light, or the meter shows no appreciate, there is a break in the wiring harness 'tween the switch and the shelling. Travel along the wiring harness, checking the hot telegram for voltage at every connection, until you find the break. Repair the break-dance.
Look for a break in the wiring between the alternate and the fan if the meter shows voltage or the light illuminates and you have tested the switch and motor. Follow the wiring harness as carefully arsenic possible between these ii locations, looking for burned out spots or breaks in the wire. When the break is located, reparation or replace the wiring harness.
References
- "Haynes Techbook, Automotive Electrical Manual"; H. Haynes; 1990
Tips
- If you retrieve neither the motor nor the substitution faulty, you may want to depart the deeper troubleshooting to a professional.
Things You'll Need
- Multimeter
- Jump shot leads
- Test light
Warnings
- Beware of shock hazards inherent in running with electrical systems, and use caution.
Writer Bio
Supported in Compass north Idaho, Troy Constant Lambert has been composition how-to pieces and real articles for magazines such as "Woodworking" and "Outdoor Idaho" since 1994. Lambert is also a novelist and has a divers subject field and ideologic education. He holds a technical authentication from the Motorcycle Mechanism Institute in Phoenix.
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