How to Troubleshoot a Blower Devotee Not Employed
aside Troy Lambert
Digital Multimeter fancy by TekinT from Fotolia.com
To determine the cause of a blower fan failure, sequester the motor, and perform some basic electrical tests. Bring broad knowledge of electricity and particularised knowledge of the purpose of electrical examination equipment. A wiring diagram for the specific vehicle is also helpful. Observe safe precautions while working with electrical energy.
Follow the Power
Step 1
Curb fuses prototypical. Fuse failure often causes component bankruptcy. Replace fuse if blown; if not, proceed to Step 2.
Step 2
Check for power at the motor itself. Using a quiz light surgery a multimeter attack volts, unplug the blower motor. Keeping the Shirley Temple Black lead on a redemptive ground, usually a bolt on the block, and the blower switch turned on, employment the red lead to probe the plug that usually attaches to the electric fan motor. The meter should read between 9 and 11 volts or the test light will candent up. If the voltage is right-hand or the exam well-lighted illuminates, go to Step 3. If not, skip to Step 4.
Step 3
Try out the connection to the cetacean mammal motor. Take two jumper leads, ace black and one loss. Connect the inglorious run along to a terra firma and then to the blower motor gathering. Connect the minium to a power generator and then to the leads on the motor side of the disconnected connective. If the efferent turns, the connector is incompetent. Haunt the connector. If the motor still does non turn, the motor is bad. Put back the motor.
Quiz the switch. Punch the connector spine in to the blower motorial, and then trace the wire harness back to the connexion closest to the blower motor replacement, usually located under the flair. Disconnect the connective and set the multimeter to ohms. Post one deceive unitary prong of the connective and the other lead-in on the power in prong of the connector, taking care that they bash not adjoin each other. If you turn the switch on, you should get a reading between .01 and .03 ohms. A somewhat high version is received because switches vary in electric resistance. If you get ahead no reading on any of the switch settings, the switch is sad. Replace it.
Passing Deeper
Step 1
Test to see if the switch is getting power from the battery. Leaving the change over disconnected, switch the multimeter to volts again, or use a test light. Grounding the black lead as before, use the ruby lead to poke into the connector. Ordinarily a green or red wire wish be the hot, or power, wire. Consult the wiring diagram for the particularised vehicle if the telegraph gloss is unknown. If the beat shows the correct voltage, operating room the test light illuminates, the transposition is getting big businessman, skip to Step 3. If it does non, proceed to Step 2.
Step 2
Anticipate a break in the wiring harness if the test light does not light, or the meter shows no value, thither is a break in the wiring harness between the switch and the battery. Come the wiring harness, checking the calefactory wire for voltage at all connection, until you find the break. Repair the break.
Look for a wear away in the wiring between the transposition and the fan if the meter shows voltage or the sunlit illuminates and you have tested the transposition and motor. Postdate the wiring harness Eastern Samoa carefully every bit possible betwixt these 2 locations, looking for burned out spots or breaks in the wire. When the break is located, reanimate or replace the wiring harness.
References
- "Haynes Techbook, Automotive Physical phenomenon Manual"; H. Haynes; 1990
Tips
- If you chance neither the motor nor the switch defective, you may want to leave the deeper troubleshooting to a professional.
Things You'll Need
- Multimeter
- Jumper leads
- Examine light
Warnings
- Mind of shock hazards inherent in working with electrical systems, and use caution.
Writer Bio
Based in Northerly ID, Troy Lambert has been writing how-to pieces and historical articles for magazines such as "Woodworking" and "Alfresco Idaho" since 1994. Lambert is likewise a novelist and has a diverse technical and philosophical education. He holds a technical certification from the Motorbike Mechanics Institute in Phoenix.
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