Possible Overheating Causes


Information and questions on GL1200 Goldwings (1984-1987)
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Red Ron
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Possible Overheating Causes

Postby Red Ron » Fri Apr 25, 2014 8:44 pm



Have a friend with an '84 1200. He has done a lot of work on it lately. Couple of the cylinders only had 90 lb. of compression and the others had 120. He fixed that. He put new timing belts on. He adjusted his valves. He had to flush the clutch and put a new clutch lever on and other numerous things. Just when he gets it running perfect it overheats at the end of a long ride. The last couple of miles of the ride are on narrow roads at about 20mph. He swears that the guage never showed hot till the last 2 miles and the fan never kicked on. He has tested the thermostat and it is ok and says the fan was plugged in after he started taking everything apart.

Any ideas on where to look?? Also he wants to leave the shield off that mounts between the radiator and the frame thinking that more air will get the radiator. Anyone know the purpose of this shield? I figure it might be to prevent excess hot air coming back onto the driver.



Red Ron
Posts: 297
Joined: Thu May 20, 2010 1:13 pm
Location: Prestonsburg, KY; Edgewater FL
Motorcycle: '08, '13 GL1800
Rear-Yoko Avid Envigor 195x55x16
Front-Battleaxe BT-45

Re: Possible Overheating Causes

Postby Red Ron » Sun Apr 27, 2014 12:31 pm

Just a followup. He has it tore down now and says that he can't get the fan to kick on. When he supplies power it will run but not on its own. He says the fuses are ok and he says the thermostat checks out ok. Could it be the wiring that goes to the stat?

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WingAdmin
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Re: Possible Overheating Causes

Postby WingAdmin » Wed Apr 30, 2014 10:20 pm

Red Ron wrote:Just a followup. He has it tore down now and says that he can't get the fan to kick on. When he supplies power it will run but not on its own. He says the fuses are ok and he says the thermostat checks out ok. Could it be the wiring that goes to the stat?


Possible. He does know that the thermostat that regulates the coolant temperature is not the same thermostatic switch that turns the fans on? Find the wire that goes to the thermostatic switch, and ground it to the engine. If the fan turns on, then the thermostatic switch is bad.

Red Ron
Posts: 297
Joined: Thu May 20, 2010 1:13 pm
Location: Prestonsburg, KY; Edgewater FL
Motorcycle: '08, '13 GL1800
Rear-Yoko Avid Envigor 195x55x16
Front-Battleaxe BT-45

Re: Possible Overheating Causes

Postby Red Ron » Thu May 01, 2014 9:21 am

Thanks. We had even taken the sensor out and held a test light and ground and used a torch to supply heat and made it activate and light up our little test light and the little light would go out when it cooled. We took the thermostat out and tested it in boiling water. The radiator fan would run when we jumped power to it. But when everything was put back together it wouldn't work. We finally started putting our little rig on each connection checking for continuity of the connectors and it was the one that supplied power to the fan




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