Temperature sensor fan switch?


Information and questions on GL1100 Goldwings (1980-1983)
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goldwingsam
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Location: Kalamazoo, Michigan
Motorcycle: 1981 gl1100 gldwing

Temperature sensor fan switch?

Postby goldwingsam » Fri Aug 17, 2012 9:40 pm



I just purchased a 1981 GL1100. It has lots of auxiliary switches and wiring, so I am going through it cleaning up the wiring. I found the fan is hard wired to a toggle switch. I am assuming the previous owner did this because the coolant temp sensor that turns the fan on was not working? I would like to return it to stock and get it all working properly. Could someone tell me where this sensor is and if my assumption sounds reasonable as to why the fan was hard wired?
Thanks
-Sam



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Bamaeagle
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1997 GL1500

Re: Temperature sensor fan switch?

Postby Bamaeagle » Sun Aug 19, 2012 7:33 pm

I am not sure on the 1100's but on the 1500 the switch is in the left radiator. It has one wire going to it. Maybe the 1100's are similar. Check the bottom of the radiators to see if you see a thing that looks like a spark plug.
JERRY

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Johnyy Smoke
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Re: Temperature sensor fan switch?

Postby Johnyy Smoke » Mon Aug 20, 2012 1:13 pm

On the 1980 gl1100 the switch is located behind the thermostat-it connects into the pipe that feeds the crossover pipes.Find the thermostat and follow behind it-you will find it.Regards,Johnyy

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Johnyy Smoke
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Re: Temperature sensor fan switch?

Postby Johnyy Smoke » Mon Aug 20, 2012 1:15 pm

And yes-the switch is bad and the p.o. wired a toggle switch to it.Regards,Johnyy

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salmon2007
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Re: Temperature sensor fan switch?

Postby salmon2007 » Tue Aug 21, 2012 9:16 am

Just a sideline on those thermo switches they are a ground switch i changed mine when i got mt bike because the fan ran all the time the next spring the fan would not come on so checking the switch out i found that just cleaning the connections solved the prob have had to do it every spring some grease on connections helps

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s_lapid
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Motorcycle: 1980 GL1100 interstate

Re: Temperature sensor fan switch?

Postby s_lapid » Fri Aug 24, 2012 6:54 am

It is not a totally bad idea to add a toggle switch to the fan wiring, even if the sensor unit is working well. if you ride on a hot summer day in the city, standing in lights etc. you might want to manually operate the fan a bit before the needle in the heat gauge goes 3/4 of the way or more towards the red zone. I realized that after blowing a head gasket. :(

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salmon2007
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Re: Temperature sensor fan switch?

Postby salmon2007 » Tue Aug 28, 2012 10:33 pm

If your temp is going 3/4 hot and your fan is running your cooling system is not operating right mine on the hottest day in traffic never goes past 1/2

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s_lapid
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Re: Temperature sensor fan switch?

Postby s_lapid » Wed Aug 29, 2012 5:48 am

Theoretically you are right - but only assuming that the heat sensors, in all the old goldwings operate the fan at exactly the same temperature, and all gauges are 100% accurate. can we be sure that a bike in which the gauge shows the needle at 3/4 of the white zone, is running hotter than that of another bike in which the needle is pointing at about the middle?
the way to test it is to measure the actual coolant temp, with a reliable thermometer. I prefer not to rely too much on these ancient gauges and I operate the fan manually each time I crawl in heavy traffic. I belive that a 30 year old bike , in extreme heat conditions will run a bit hotter ,than in a cooler day on an open highway - even if it is well maintained, with a good clean radiator and new OEM water pump (like mine..)

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scotterichmond
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Re: Temperature sensor fan switch?

Postby scotterichmond » Wed Aug 29, 2012 8:04 am

s_lapid wrote:Theoretically you are right - but only assuming that the heat sensors, in all the old goldwings operate the fan at exactly the same temperature, and all gauges are 100% accurate. can we be sure that a bike in which the gauge shows the needle at 3/4 of the white zone, is running hotter than that of another bike in which the needle is pointing at about the middle?
the way to test it is to measure the actual coolant temp, with a reliable thermometer. I prefer not to rely too much on these ancient gauges and I operate the fan manually each time I crawl in heavy traffic. I belive that a 30 year old bike , in extreme heat conditions will run a bit hotter ,than in a cooler day on an open highway - even if it is well maintained, with a good clean radiator and new OEM water pump (like mine..)


100% accurate. you need a known accurate thermometer to be sure.

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Gr8Heath
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Re: Temperature sensor fan switch?

Postby Gr8Heath » Thu Aug 30, 2012 2:28 pm

My fan is also wired to a toggle switch. I've heard from many owners that the thermostat sensor repeatedly goes bad. My father has a 82 gl1100i and we replaced that sensor3 times in 2 years. he didn't want to have to use a switch. he quickly reconsidered after riding mine. I guess he thought it would be a hassle to operate a switch. it's no big deal to me.

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scotterichmond
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Re: Temperature sensor fan switch?

Postby scotterichmond » Thu Aug 30, 2012 3:25 pm

both would not be a bad thing.

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urbanmadness
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Re: Temperature sensor fan switch?

Postby urbanmadness » Mon Jul 14, 2014 12:11 am

Another benefit, is when it cold out. You can hit the switch and get a little warm air when you are at an intersection... :D

Since these sensors do give trouble, I added one. Even with the new sensor, that way, I have a back up when I'm away from home.

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1fastgl1100
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Re: Temperature sensor fan switch?

Postby 1fastgl1100 » Mon Jul 14, 2014 9:02 am

My 83 in Florida (outside temps over 100 degrees) then add the engine operating and long read lights with only 100 degree air being pulled thru the fan... yeah the bike gets hot.. I run a 165 degree thermostat and check coolant regularly, yet temps climb well over 1/2 the gauge...

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Wilcoy02
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Re: Temperature sensor fan switch?

Postby Wilcoy02 » Mon Jul 14, 2014 11:05 am

The sensor can be taken apart and cleaned. Works like a new one.

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Wilcoy02
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1983 GL1100I frame with an 80 engine. poor boy installed with C-5 ignition--DIED in Grande Prairie Alberta Canada 8/15


98 valkyrie sold 8/16

Re: Temperature sensor fan switch?

Postby Wilcoy02 » Wed Oct 22, 2014 9:15 am

Here is the link that showed me how to do it.

http://www.classicgoldwings.com/forum/v ... fan+switch

rkmason
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Re: Temperature sensor fan switch?

Postby rkmason » Fri Oct 24, 2014 8:54 am

I think all the previous posts have provided the info you needed. Just wanted to add some info about the alternate thermo fan switch that some are using. I am working in that area on my '81 GW right now. Littlebeaver has used this fan switch and mating connector from a '94 Geo Metro 1.0L. I am about to do the same and splice this connector into my wiring harness, replacing the OEM switch and wiring plug. The thermo switch is available at normal auto parts outlets for $15 to $45; the connector pigtail was salvaged from a wrecking yard Geo Metro for $3.50.

AIRTEX / WELLS Ref info

Cooling Fan Switch PN: 1S4485

Terminal No.: 2

Terminal Type: male blade

Thread Size: M18x1.5

Normal State: open

Specification: makes @ 216F +- 8F; breaks @ 206F +- 8F
Attachments
'94 Geo Metro Fan Switch & Wiring Connector
'94 Geo Metro Fan Switch & Wiring Connector

rkmason
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Re: Temperature sensor fan switch?

Postby rkmason » Sun Oct 26, 2014 7:41 am

rkmason wrote:I think all the previous posts have provided the info you needed. Just wanted to add some info about the alternate thermo fan switch that some are using. I am working in that area on my '81 GW right now. Littlebeaver has used this fan switch and mating connector from a '94 Geo Metro 1.0L. I am about to do the same and splice this connector into my wiring harness, replacing the OEM switch and wiring plug. The thermo switch is available at normal auto parts outlets for $15 to $45; the connector pigtail was salvaged from a wrecking yard Geo Metro for $3.50.

AIRTEX / WELLS Ref info

Cooling Fan Switch PN: 1S4485

Terminal No.: 2

Terminal Type: male blade

Thread Size: M18x1.5

Normal State: open

Specification: makes @ 216F +- 8F; breaks @ 206F +- 8F

FYI, I found an online source for new connector kits to fit this Geo Metro thermo switch. The connector is a Sumitomo MT 090 Series part. This guy also has replacement connector kits for some of the other troublesome OEM GW wiring connectors.
http://www.cycleterminal.com/mt-series-090.html

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SilverDave
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Re: Temperature sensor fan switch?

Postby SilverDave » Sun Oct 26, 2014 1:39 pm

After re-doing ALL the cooling system ( hoses, cap, thermostat, sensor switch and rad cleaning/repainting )
... I decided to add a manual over-ride switch , as the overheating probably caused the head gasket problem .

I chose to add a small toggle switch near the left thumb position , and a 12 v green LED wired to indicate when the fan was actually running ,
either from the built-in thermo switch or the toggle switch .

After running this way, for 14 months,I can report that a cleaned up rad will almost always keep the temperature in the best range ( 4 bars to 7 or 8 bars on my 1200)

and almost every time I see the temp climbing, and consider using the toggle over-ride...the thermo switch has beaten me to it , and already turned the fan on !!!

In other words the BEST part of the over-ride switch-LED installation was the LED part .
I probably glance at that bright green LED more than I look at any other idiot light on my bike .

These machines with border-line cooling systems should have come with a fan idiot light installed, IMHO

SilverDave

shalbleib
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Re: Temperature sensor fan switch?

Postby shalbleib » Fri May 22, 2015 11:32 am

quick question, my fan is not coming on. I acquired the bike with some modified worrying so I'm trying to find out if it's a bad switch or bad wiring. If I short the plug going to the temp switch, shouldn't that run the fan? I've tested the fan a 12v directly to the plug and it runs if my power source is grounded, but I can't get it to run when trying to use the ground wire going to the switch.

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Fatwing Chris
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Re: Temperature sensor fan switch?

Postby Fatwing Chris » Fri May 22, 2015 2:29 pm

shalbleib wrote:quick question, my fan is not coming on. I acquired the bike with some modified worrying so I'm trying to find out if it's a bad switch or bad wiring. If I short the plug going to the temp switch, shouldn't that run the fan? I've tested the fan a 12v directly to the plug and it runs if my power source is grounded, but I can't get it to run when trying to use the ground wire going to the switch.


If there is 2 wires on the sensor then shorting/jumping the 2 should turn the fan on.
If I'da known it would last this long,I'da taken better care of it.
Chris
Double Dark
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shalbleib
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Re: Temperature sensor fan switch?

Postby shalbleib » Fri May 22, 2015 3:45 pm

that's what I figured but no dice. trying to figure out where to go from here. I tested continuity so I know the wires not broke from the fan to the plug....

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Wilcoy02
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1983 GL1100I frame with an 80 engine. poor boy installed with C-5 ignition--DIED in Grande Prairie Alberta Canada 8/15


98 valkyrie sold 8/16

Re: Temperature sensor fan switch?

Postby Wilcoy02 » Sat May 23, 2015 1:15 am

I believe the engine grounds when installed.

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Fatwing Chris
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Re: Temperature sensor fan switch?

Postby Fatwing Chris » Sat May 23, 2015 7:33 am

Wilcoy02 wrote:I believe the engine grounds when installed.


It would ground through the engine block if it was a 1 wire set-up.
If I'da known it would last this long,I'da taken better care of it.
Chris
Double Dark
Darkside # 1602

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WingAdmin
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Re: Temperature sensor fan switch?

Postby WingAdmin » Tue May 26, 2015 11:52 am

Fatwing Chris wrote:
Wilcoy02 wrote:I believe the engine grounds when installed.


It would ground through the engine block if it was a 1 wire set-up.


Power comes from the ignition on a solid black wire. This connects (through a connector) to a black/blue wire. This goes through the two-pin fan connector to a blue wire which goes to the fan. A black wire comes out of the fan, through the two-pin fan connector into another black wire, and to the thermo switch. This thermo switch connects the black wire to a green wire when it is closed, and this green wire connects to ground.

Therefore, if you ground the black wire coming out of the fan, the fan should run. This will validate that the power getting to the fan is intact.

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petesgoldwing
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Re: Temperature sensor fan switch?

Postby petesgoldwing » Sat Jul 04, 2015 9:33 am

Bit late with this post but I use both sensor and the toggle switch I put on, if sensor stops working I just flip the switch on. Great idea. :idea:




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