Honda Civic / Del Sol (1992 - 2000) EG/EH/EJ/EK/EM1 Discussion

Fan not turning on

 
Old 12-29-2018, 10:28 PM
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Default Fan not turning on

Hello all,
Turned a/c on, in my 96 civic ex; but fan did not turn on...Tried fan without a/c, still nothing.
Not sure, if there's a fuse or something simple to check, so I appreciate your feedback, on troubleshooting!
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Old 12-29-2018, 11:37 PM
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Default Re: Fan not turning on

fan as in blower motor? fan as in condenser fan? fan as in radiator fan?
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Old 12-30-2018, 04:50 AM
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Default Re: Fan not turning on

Originally Posted by eghatch9295 View Post
fan as in blower motor? fan as in condenser fan? fan as in radiator fan?
Fan, as in the one that is turned on, off and controlled here...


Last edited by g4384063; 12-30-2018 at 05:16 AM.
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Old 12-30-2018, 06:49 AM
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Default Re: Fan not turning on

Check these two fuses:


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Old 12-30-2018, 07:48 AM
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Default Re: Fan not turning on

Locate the blower motor under the dash all the way on the right side. The 2 wire plug with the large blue-white and blue-yellow wires should be visible. Turn on the key and set the blower switch to 4. With the plug still plugged into the motor, measure the voltage from each of the wires to ground.

No power on the blue-white wire: blown 40A fuse under the hood, lack of power from the 7.5A fuse 17, or bad relay under the hood.
Power on the blue white wire, also 12 volts on the blue-black wire: Bad blower switch, resistor, or wiring on the ground side of the circuit. If you jump the blue-black wire to ground the motor should take off at full speed.
Power on the blue white wire, zero volts on the blue-black wire: Motor is bad.
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Old 12-30-2018, 09:17 AM
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Default Re: Fan not turning on

Originally Posted by muellersfan View Post
Check these two fuses:

Thanks!
Took a look, at both and neither one appears to be blown or burnt.
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Old 12-30-2018, 09:21 AM
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Default Re: Fan not turning on

Originally Posted by g4384063 View Post
Thanks!
Took a look, at both and neither one appears to be blown or burnt.
You can test whether the blower motor is bad by running power and ground wires directly from the battery to the the blower motor. If the motor does not run, replace it. If it runs, use a multimeter to do the tests suggested by mk.
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Old 12-30-2018, 01:35 PM
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Default Re: Fan not turning on

Originally Posted by mk378 View Post
Locate the blower motor under the dash all the way on the right side. The 2 wire plug with the large blue-white and blue-yellow wires should be visible. Turn on the key and set the blower switch to 4. With the plug still plugged into the motor, measure the voltage from each of the wires to ground.

No power on the blue-white wire: blown 40A fuse under the hood, lack of power from the 7.5A fuse 17, or bad relay under the hood.
Power on the blue white wire, also 12 volts on the blue-black wire: Bad blower switch, resistor, or wiring on the ground side of the circuit. If you jump the blue-black wire to ground the motor should take off at full speed.
Power on the blue white wire, zero volts on the blue-black wire: Motor is bad.
Thanks, thatís very helpful!

Problem is, I donít understand, what it means to and/or how to measure the voltage from wires to ground with a multi meter. 🙁
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Old 12-30-2018, 01:46 PM
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Default Re: Fan not turning on

Originally Posted by g4384063 View Post
I don’t understand, what it means to and/or how to measure the voltage from wires to ground with a multi meter. ��
Voltage is measured relative to ground.

Set meter to measure DC voltage.

Touch red (+) meter probe to wire or pin where you wish to measure voltage.

Touch black (-) meter probe to a metal part of the chassis or to the ground (-) post of the battery.
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Old 12-31-2018, 01:04 AM
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Default Re: Fan not turning on

Originally Posted by muellersfan View Post
You can test whether the blower motor is bad by running power and ground wires directly from the battery to the the blower motor. If the motor does not run, replace it. If it runs, use a multimeter to do the tests suggested by mk.
Originally Posted by muellersfan View Post
Voltage is measured relative to ground.

Set meter to measure DC voltage.

Touch red (+) meter probe to wire or pin where you wish to measure voltage.

Touch black (-) meter probe to a metal part of the chassis or to the ground (-) post of the battery.
Thanks, thatís very helpful!
I appreciate you explaining how to measure voltage relative to ground. I believe I understand now. 👍

As for running power and ground wires directly from the battery to the blower motor. Do I disconnect terminal wires, from battery and connect blower motor wires to battery, somehow?

Last edited by g4384063; 12-31-2018 at 08:33 AM.
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Old 12-31-2018, 09:48 AM
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Default Re: Fan not turning on

Originally Posted by g4384063 View Post
As for running power and ground wires directly from the battery to the blower motor. Do I disconnect terminal wires, from battery and connect blower motor wires to battery, somehow?
Yes, or don't disconnect battery terminals and connect wires to the battery terminals.

You need two wires (power and ground) sufficiently long to extend from the battery posts to the disconnected terminals of the blower motor.
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Old 01-03-2019, 07:17 AM
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Default Re: Fan not turning on

Originally Posted by muellersfan View Post
Yes, or don't disconnect battery terminals and connect wires to the battery terminals.

You need two wires (power and ground) sufficiently long to extend from the battery posts to the disconnected terminals of the blower motor.
Great, thanks!
Hopefully, winter will return to FL, for a bit and I can just open windows, for a while and work on this, in the meantime.
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Old 05-06-2019, 10:56 AM
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Default Re: Fan not turning on

Starting to heat up, so I took the car into the auto AC guy, who replaced compressor, etc. last summer. I told him fan not turning on and he went right for the blower motor under glove box. He tapped on it a few times with a screwdriver and bingo...Fan turned on. He said buy a blower motor for like $40 and throw it in...Itís like 2 screws and a plug. In the meantime, fan is turning on and I have AC. 😎

That said, CEL just started coming on and AZ free scan showed code P1509, idle air control valve circuit failure. What are the chances that the faulty blower motor had any cause and/or affect on the idle air control valve?
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Old 05-06-2019, 01:02 PM
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Default Re: Fan not turning on

Yes if you tap the blower and it starts to run (for a while) it is worn out and replacing it should fix the problem.

As for the IACV, it's not related. IACV can be tested with an ohm meter.
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Old 05-07-2019, 07:15 AM
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Default Re: Fan not turning on

Originally Posted by mk378 View Post
Yes if you tap the blower and it starts to run (for a while) it is worn out and replacing it should fix the problem.

As for the IACV, it's not related. IACV can be tested with an ohm meter.
Thanks!
As for blower motors with wheel, Im looking at:
TYC, $28.79 with Limited Lifetime warranty
vs.
4 Seasons, $33.79 or $27.79 w/o wheel both with 12 Months / 12,000 Miles warranty.

As well as, blower motor resistors: WVE/Airtex/Wells, $13.23 with 3 year / 36,000 miles warranty
vs.
4 Seasons, $17.08 with 120 days warranty.

Thoughts?

Last edited by g4384063; 05-07-2019 at 07:40 AM.
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Old 05-07-2019, 04:14 PM
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Default Re: Fan not turning on

I would pull the motor / wheel assembly, see how badly the wheel has been eaten by mice, check that you can loosen the nut or clamp and remove the wheel in one piece, then decide from there.

It doesn't seem that you need a new resistor. When the motor does spin, does it work on all speeds?

Also DO NOT test run the motor plugged into the car but not mounted with a wheel in the case, the resistor WILL burn out.
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Old 05-07-2019, 04:36 PM
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Default Re: Fan not turning on

Yeah, cleaning the blower motor helps too.
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Old 05-07-2019, 04:59 PM
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Default Re: Fan not turning on

i've had good luck with 4 seasons motors and airtex icm fwiw.
havent done any tyc but the blower gets a red heart on rockauto too
so all those brands are solid choices.
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Old 05-08-2019, 04:56 AM
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Default Re: Fan not turning on

Originally Posted by mk378 View Post
I would pull the motor / wheel assembly, see how badly the wheel has been eaten by mice, check that you can loosen the nut or clamp and remove the wheel in one piece, then decide from there.

It doesn't seem that you need a new resistor. When the motor does spin, does it work on all speeds?

Also DO NOT test run the motor plugged into the car but not mounted with a wheel in the case, the resistor WILL burn out.
Thanks!
Iíll check out motor / wheel assembly as you described and see where Iím at.

Yes, when the motor does spin, it works on all speeds.

A bit confused about what you mean about test run that will make resister burn out.
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Old 05-08-2019, 04:58 AM
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Default Re: Fan not turning on

Originally Posted by tony_2018 View Post
Yeah, cleaning the blower motor helps too.
Thanks!
The faulty motor or wheel...
Or both?
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Old 05-08-2019, 05:03 AM
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Default Re: Fan not turning on

Originally Posted by tamboo View Post
i've had good luck with 4 seasons motors and airtex icm fwiw.
havent done any tyc but the blower gets a red heart on rockauto too
so all those brands are solid choices.
Great, thanks, appreciate your feedback!
The blower gets a red heart on...Thatís what she said. 😉
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Old 05-08-2019, 07:49 AM
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Default Re: Fan not turning on

Just found out my condenser fan was replaced before, and with the same part. Looks like its time to find another source. It was a TYC and it lasted only 3 yrs.
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Old 05-16-2019, 09:10 AM
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Default Re: Fan not turning on

Originally Posted by tony_2018 View Post
Just found out my condenser fan was replaced before, and with the same part. Looks like its time to find another source. It was a TYC and it lasted only 3 yrs.
Appreciate the info...I guess sometimes a better warranty does not mean a better part.
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