Temp running hot


Information and questions on GL1200 Goldwings (1984-1987)
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Lucky713
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Joined: Fri Dec 31, 2010 1:26 am
Location: DeWitt, Mi
Motorcycle: 1986 GL1200 Aspencade SEI

Temp running hot

Postby Lucky713 » Tue May 15, 2012 8:05 pm



I have a 1986 gl1200 SEI. I have had the bike for 2 years. The temp gauge always is at 3 bars. I road it last week, 3 bars. I ride it to work today, and the temp starts spiking. It went to 4 bars, and by the time I got to work, which is a 20 minute ride on back roads, it was up to seven bars. Checked the coolant and the resevoir tank was low. Filled it up. took it for a 20 minute ride during lunch. still went up to 7 bars by the end of the ride. Same thing on the ride home. So my question is, where do I start. My thoughts are the thermostat has gone bad, or I have a bad water pump. I have had no fluid leaking from the bike or from the radiator as far as I can tell. Also, I did check the radiator fan, and it is running when I am stopped. Any suggestions on what I should look at first?



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WingAdmin
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Re: Temp running hot

Postby WingAdmin » Tue May 15, 2012 8:12 pm

When the water pump fails, it's generally bearings, and that causes wobble that kills its seals. Once that happens, you'll see coolant leaking out the weep hole on the bottom of the pump housing. So if you're not seeing coolant leaking, it's a safe bet that your pump is OK. My first guess would be a thermostat that is stuck closed, not allowing sufficient coolant to circulate.

bustedwing
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Re: Temp running hot

Postby bustedwing » Tue May 15, 2012 8:51 pm

I agree with wing, the thermostat is more than likely the culprit, since you made no mention of coolant leak. I would pressure test the system cold first checking for any leaks, and include the radiator cap.Then if that shows nothing go ahead and change the thermostat and gasket, check the fluid.If it has been some time since it has been changed now is a good time. Refill and recheck.
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Lucky713
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Joined: Fri Dec 31, 2010 1:26 am
Location: DeWitt, Mi
Motorcycle: 1986 GL1200 Aspencade SEI

Re: Temp running hot

Postby Lucky713 » Thu Jul 19, 2012 5:33 pm

Sorry about the late response, but thought I better let everyone know what the problem was so others can learn from my experience. It was the thermostat. since I replaced the thermostat I have had no problems at all with the temp. thanks for the help Wing & Bustedwing.

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maestro319
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Location: West Chicago, IL
Motorcycle: 1986 Honda Goldwing 1200 Aspencade

Re: Temp running hot

Postby maestro319 » Thu Jul 19, 2012 6:36 pm

How do you "pressure test" the cooling system? Need any special "tools" or equipment? I am new to biking so please, bear with me and my questions.

bustedwing
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Re: Temp running hot

Postby bustedwing » Thu Jul 19, 2012 7:49 pm

You can pick up a pressure testing kit at any auto parts store but be sure you get the adapters for the small caps and radiators as the regular ones for cars are too big for the bikes. Glad to hear you have the overheating problem figured out. Ride safe.


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