Question about 1991 Honda Civic

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1991 civic lx wireing diagram (heater blower )

My heater and a/c blower doesn't work. the fuses are all good. what would be the next thing to check?

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The blower motor resistor is most probably the problem.

Posted on Nov 09, 2008

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If your really cheap like me... consider the easy way & then read on...

shop cost for diagnosis is about $100...
bid for the repair of heater fan including a new motor, speed switch... resistor switch and diode/relay etc.. $700

the heater blower motor has little spring loaded carbon brushes that ride the armiture... the the blower motor brushes are likely worn out. its a ***** to get the motor free of the fan housing [looks like "squirrel running cage" under dash passenger side] but if you can remove the motor ... + the cage so to expose the motor shaft [the plastic cage will come off easily if you carefully pull it straight away from the motor] you see two screw heads... remove the two screws holding the motor cover... remove the motor cover... it'll come off but you may need to try to wiggle & pull if its stuck.... when the cover is off you'll see a lot off hard to wash off your skin ... blackcarbon/brownish copper powder & the motor armeture - surrounded by the brush housing...

[warning! do not think ha! i'll just blow real hard & getthat **** out of there! after you wipe the stuff out of your eyes you may just wind up looking like rocky racoon for several days & have your kids & wife laughing so hard.. til they pee their pants & co-workers that give you a little more space than usual... ]

[mind you... it's not that i did something that stupid ... i just think it would happen that way... if you did just ..uh.. blew real hard... ]

notice two copper leads... one to each brush... notice the spring that pushes the brush against the armeture... if the armeture badly scored you may need to admit defeat and buy a new or salvage motor.... the brushes are pretty small and tough to buy replacements for but if you have an old power hand tool/drill that you always wanted to see the insides of you may just find brushes that fit... even if you have to buy an junk drill to find brushes it may be worth it... a new motor is very pricey $150+... assuming your still game ... turn the motor upside down and tapping & scrapping to clean the dust out... remove & replace brushes solder leads to brushes reassemble the motor housing, reassemble the motor & squirrel cage...reassemble dash & glove box

Posted on Mar 26, 2009

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CLICK HERE for your Blower Motor Circuit Diagram.

There are 2 fuses for your blower.
One Hot all times ( #35 under Hood 40A)
One Switched power (under dash fuse #9 7.5A)

If BOTH fuses check out good, there is a relay under the dash.
(Yellow with black stripe ) and (Black) wires coming out of it.

With the ignition on, and blower set on 1, verify power at Yellow with black wire at the blower.

If there is power, your blower moter has failed.

If you need more help, let me know.

Thanks for using FixYa - a FixYa rating is appreciated for taking the time to answer your FREE question.

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