Overheating


Information and questions on GL1200 Goldwings (1984-1987)
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pointpounder
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Location: Farmington, NM
Motorcycle: 87 interstate

Overheating

Postby pointpounder » Thu Aug 30, 2012 11:25 am



I have an 87 interstate that runs at the edge of red all the time. I have replaced the thermostat, the fan. Had the radiator cleaned and repainted. water pump looks fine (steel impeller). 50/50 antifreeze. What is left to do?



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WingAdmin
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1982 GL1100A Aspencade (sold)
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Re: Overheating

Postby WingAdmin » Thu Aug 30, 2012 11:27 am

Have you checked the actual temperature of the engine/coolant using an external thermometer (IR works well), to rule out the gauge/sensor itself being faulty?

pointpounder
Posts: 18
Joined: Tue Aug 14, 2012 3:23 pm
Location: Farmington, NM
Motorcycle: 87 interstate

Re: Overheating

Postby pointpounder » Thu Aug 30, 2012 11:31 am

No I have not. What is this IR that you speak of?

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WingAdmin
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Re: Overheating

Postby WingAdmin » Thu Aug 30, 2012 11:48 am

Ir = Infrared. A non-contact thermometer, that reads the temperature of whatever you point it at:

IR Thermometer
IR Thermometer

pointpounder
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Re: Overheating

Postby pointpounder » Thu Aug 30, 2012 11:55 am

Thank you for your responce. Next comes the question what temp range should the bike run at.

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WingAdmin
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Re: Overheating

Postby WingAdmin » Thu Aug 30, 2012 12:11 pm

They don't specify it, but we can garner some information from the service manual.

The thermostat begins to open up at 176F to 183F, and should be fully open at 199F to 206F, so we can guess that should be the lower level. Boiling point for the coolant (with cap on) is 258F, so that is the absolute maximum - it should never reach this point.

However, the manual DOES specify what the gauge should be showing at various coolant temperatures:

Temperature Gauge Calibration
Temperature Gauge Calibration

pointpounder
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Location: Farmington, NM
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Re: Overheating

Postby pointpounder » Thu Aug 30, 2012 12:49 pm

It was suggested that I remove the thermostat and see what happens. what do you think.

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WingAdmin
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Re: Overheating

Postby WingAdmin » Thu Aug 30, 2012 1:32 pm

Well removing the thermostat will cause it to flow coolant with no restriction at all. If the bike still overheats, then the problem is elsewhere. If it doesn't, then you know the thermostat is faulty.

antiqbob
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Re: Overheating

Postby antiqbob » Sat Sep 08, 2012 2:13 pm

With respect to removing the thermostat it has always been my experience that removing the thermostat allows the coolant to move too fast and does not allow the coolant to remove the heat from the engine...
It is possible to put the thermostat into a pan of water and heat it to see if it opens and at what temperature.

A possible suggestion from my not working fan :cry: .. Have you checked to see if the cooling fan is operating?
Good luck
antiqbob

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SKMURDOCK
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Re: Overheating

Postby SKMURDOCK » Mon Sep 10, 2012 7:36 am

antiqbob wrote:It is possible to put the thermostat into a pan of water and heat it to see if it opens and at what temperature.


That is what I was thinking also. I remember my dad doing this very thing to check a thermostat. Very quick and easy. If I recall correctly they are marked with their operating temperature so you can tell not just if it opens, but if it opens at the right temp. Only takes as long as you need for your stove to boil a pan of water.

pointpounder
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Joined: Tue Aug 14, 2012 3:23 pm
Location: Farmington, NM
Motorcycle: 87 interstate

Re: Overheating

Postby pointpounder » Mon Sep 10, 2012 8:02 am

I did check the thermostat with water 20' hotter than 82' marked. I found that it opens a small amount about .03 thousants of an inch. Went to auto zone bought a new one samething. So I went a head and removed it and the bike is running way cooler than it ever has.




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