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Bruce C
Novice
Dec 1, 2009, 11:15 AM
Post #1 of 8
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blower motor malfunction
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My 1998 Honda Accord LX has a heater motor that won't work on speeds 1,2,and 3, but works on High, speed 4.
Power at motor power plug shows 4 volts (+ -) on speed 1,2, and 3, and full voltage on speed 4. I removed motor and squirrel cage (full of insulation!), disassembled the motor assembly, used a can of cleaner spray to remove the carbon, and reassembled it. On the bench, all 4 speeds work fine (windmills at about 2 volts). But, no change when mounted in car. I am now looking at the speed selector switch, but can't get an ohmmeter test out of it. Am I missing something somewhere?
(in 45 years of driving, this is by far the best car I've owned.)
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Hammer Time
Ultimate Carjunky
/ Moderator
Dec 1, 2009, 2:33 PM
Post #2 of 8
(2456 views)
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Re: blower motor malfunction
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The speeds are controlled from the ground side of the circuit. What you likely need is a new blower motor resister which is located right next to the motor.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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DanD
Veteran
/ Moderator
Dec 1, 2009, 2:34 PM
Post #3 of 8
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Re: blower motor malfunction
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Dito
You beat me to the punch Hammer. LOL
Dan.
Canadian "EH"
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Bruce C
Novice
Dec 1, 2009, 4:00 PM
Post #4 of 8
(2442 views)
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Re: blower motor malfunction
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How could I have missed that, with taking the motor in and out? But, I didn't know what it was anyway.
I have it in hand, will replace it, and report back.
Thank You Both! And thank you for a well-done forum. I'll check if my motor-head son visits here.
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Loren Champlain Sr
Veteran
/ Moderator
Dec 1, 2009, 6:15 PM
Post #5 of 8
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Re: blower motor malfunction
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Agree with HT and Dan; But, you're going to have to perform a 'mouse-ectomy'. That insulation didn't get there on it's own.
Loren
SW Washington
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Bruce C
Novice
Dec 12, 2009, 5:58 PM
Post #6 of 8
(2418 views)
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Re: blower motor malfunction
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Quick, easy replacement, 2 screws and a plug.
Could one of you explain how the resistor works?
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steve01832
Veteran
Dec 12, 2009, 6:50 PM
Post #7 of 8
(2412 views)
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Re: blower motor malfunction
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All it does is add resistance to the ground side making the motor turn slower on the lower speeds. Similar to adding corrosion to a wire making current harder to flow through a circuit.
Steve
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Hammer Time
Ultimate Carjunky
/ Moderator
Dec 12, 2009, 6:51 PM
Post #8 of 8
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Re: blower motor malfunction
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The resister supplies the ground for the motor that is powered all the time. The are multiple resisters in there of different values. the higher the resistance the ground passes through, the slower the motor runs. A direct ground, which is bypassing the resister would be high speed.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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