Radiator Fan Motor 1981 GL1100

Information and questions on GL1100 Goldwings (1980-1983)
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Posts: 12
Joined: Fri Mar 23, 2012 7:51 pm
Location: Evergreen, Colorado
Motorcycle: 1981 GL 1100 was an I now is naked!

Radiator Fan Motor 1981 GL1100

Post by GL1100Newbie » Fri Apr 13, 2012 6:42 pm

The radiator fan motor does not go on to cool the engine. This is a project bike and all the wiring appears to be sound. I have two questions for anyone who has solved this problem.
1. What the most likely cause of this problem? The fan motor or the thermostat switch?

2. If it turns out to be the fan motor can the fan motor be removed and replace without removing the radiator? On a manual dextarity from 1 to 10, I rank somewhere between 1 and 2.


Posts: 4
Joined: Fri Feb 26, 2010 7:48 pm
Location: Wausau, WI
Motorcycle: 1981 GL1100

Re: Radiator Fan Motor 1981 GL1100

Post by jwkittel » Fri Apr 13, 2012 8:20 pm

You can check the fan motor while it is in the bike. Disconnect the leads and use flat plugs for electrical connections to run leads to a good power source no greater than the bikes battery output. If the fan runs then the cause is the thermostat.

If the fan does not run the radiator will have to be removed. Follow the first portion of the maintenance book for removing the engine. Only just remove the radiator.

I had a similar problem with my gl1100 before only that was the thermostat and I solved the problem with a bypass switch to manually turn the fan on when the engine hit mid way on the temp gauge.

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Re: Radiator Fan Motor 1981 GL1100

Post by littlebeaver » Sat Apr 14, 2012 2:00 am

Your going to conduct a quick and simple test, first on the right side of the bike if your sitting on it, remove the lower fairing part, look in just under the fan area with a flash light you will see a rubber plug with two wires coming out of it reach in and unplug it, that's your fan switch...ok.. look at the plug see those two holes get a wire and cut the plastic part off both ends and place one in the first hole, doesn't matter which hole now when you place the wire in the second hole the fan will come on...If this happens it's your fan switch is bad, you are just hot wiring it..but sure the key is on..Replace the fan switch if you want to fix it to come on automatically, if not install a toggle switch and turn it on and off manually..

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