radiator fan not working


Information and questions on GL1000 Goldwings (1975-1979)
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parmdeep
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Motorcycle: honda gl1000 1977

radiator fan not working

Postby parmdeep » Thu Mar 31, 2011 12:00 pm



hai I just bought Honda gl 1000 1977 .after some miles running it got overheated and when I looked the fan that was not running.can any body tell me the right way what can I do and also the temreture gauge also not working.
thnx



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WingAdmin
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Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
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Re: radiator fan not working

Postby WingAdmin » Thu Mar 31, 2011 12:48 pm

Have you checked to see if there is any coolant in the bike?

Normally I would have you first check the temperature gauge sender and fan thermo switch, but the fact that both of those seem not to be working could be due to the fact that there could be no (or very little) coolant in the bike. Check that first.

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virgilmobile
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Re: radiator fan not working

Postby virgilmobile » Thu Mar 31, 2011 1:22 pm

Short the 2 wires together that go to the temp switch.This should run the fan.If it does,the switch is bad,If it doesn't the fan is bad or has no power.The switch is located at the thermostat housing,center and front of the top of the block,next to the upper radiator hose.Access from the right side.The gauge is powered from a 7 volt regulator which also powers the fuel gauge.If the fuel gauge is working but not the temp gauge,it will be a problem with the temp sending unit,a single wire unit near the thermostat.See the attached pix.
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virgilmobile
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81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: radiator fan not working

Postby virgilmobile » Thu Mar 31, 2011 2:01 pm

If this your first experience with a wing,remember,it is a 4 cylinder water cooled boxer engine and does run in the 165-195 degree range.This can feel very warm just sitting on it.I think the fan kicks on at near 195 degrees.

sfruechte
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Location: La Crosse, WI
Motorcycle: 1977 GL1000

Re: radiator fan not working

Postby sfruechte » Fri Apr 01, 2011 12:56 pm

Does your gas guage work? There is a voltage regulator that both the temperature guage and the gas guage use. When this regulator went bad on my bike, both the gas guage and the temperature guage pegged on the high side.

shalbleib
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Joined: Thu Dec 18, 2014 7:23 am
Location: Louisville, KY
Motorcycle: 78 GL1000

Re: radiator fan not working

Postby shalbleib » Thu May 21, 2015 10:39 am

virgilmobile wrote:Short the 2 wires together that go to the temp switch.This should run the fan.If it does,the switch is bad,If it doesn't the fan is bad or has no power.The switch is located at the thermostat housing,center and front of the top of the block,next to the upper radiator hose.Access from the right side.The gauge is powered from a 7 volt regulator which also powers the fuel gauge.If the fuel gauge is working but not the temp gauge,it will be a problem with the temp sending unit,a single wire unit near the thermostat.See the attached pix.


Ok, so I'm not running any gauges. My fan isn't coming on. I shorted the 2 wires together at the temp switch and get nothing but if I unplug the fan and hit it w/ 12v, it fires right up. Am I not getting power to the switch? I've looked at the wiring diagram but get a little turned around. Seems like there should be power coming to the temp switch, it reaches temp, closes the circuit and sends the voltage to the fan. No?

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virgilmobile
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81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: radiator fan not working

Postby virgilmobile » Thu May 21, 2015 11:26 am

No.power does not feed the switch.
10amp fused key switched 12 volts feeds the fan.The temperature switch is the ground.If you have glass fuses,use a test light ,with the key on,probe each side of the fuses at the fuse holder clip. Sometimes a fuse is good and a bit of corrosion or weak clip will stop the electric.Test this with the temp switch wires connected together.Just as if you were trying to force the fan to run.This puts a load on the circuit.if it's not loaded with the fan motor,a bad fuse or corroded connection may pass enough power to light up a test light and fail as soon as a fan is attached.

tinkertoys
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Re: radiator fan not working

Postby tinkertoys » Thu May 21, 2015 12:03 pm

I had a similar problem a few years back when i still had my 82 wing. I got hold of a 2nd switch and it also either failed or was no good to start with. So I solved the problem by bypassing everything and wiring the fan direct to one of the switches on the left faring dash panel.
When it was hot out or travelling in city traffic, I just put the switch on. Really I left it on most times except when I was on a highway run. Worked well for me for about 6 or 7 years and still going strong for the friend who bought my bike. Pretty easy fix really.




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