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cooling problem

Old 08-18-2005, 10:15 AM
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cooling problem

Today I returned to home. It was a warm day.
Riding in town, the temperature increased to 110C = 230F.
The fan did not start.
When I reached home, the temperature increases to 112C = 233F and I stopped the bike.
The "cooling tank" rejected some antifreeze per its higher hose (1/4 liter) with a little sound like "blubblublub" near the "thermostat".

I switch the key on with motor stopped: the fan didn't start, temperature at 112C-230F.

I waited until temperature decreased to 110C (230F) and restarted the bike.
The fan does not started until it reached 112C (233F) and then started.
Then temperature decreased to 110C (230F) then fan stopped and the temperature reincreased to 112C (233F) then fan restarted and so on.

Usually, the fan starts at 108C-226F (that is high my taste) but today, it started at 112C-233F and I lose some antifreeze.

What should I check ?
bleeding cooling system ? Replace Thermocontactor on the radiator ?
Thermostat ? Too much cooling antifreeze ?
I've checked antifreeze level last week and it was precisely at the "full" mark on the "cooling tank"
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Old 08-18-2005, 10:28 AM
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Consider replacing the radiator cap.
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Old 08-18-2005, 10:39 AM
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Re: cooling problem

Why do you think it's the radiator cap ?
Air in the circuit that prevents thermocontactor to start fan motor ?
How can I check radiator cap ?
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Old 08-18-2005, 12:40 PM
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Because your problem is a relatively minor variation, rather than major overheating. The cap can't really be tested without a special tool and is pretty cheap.

There is a car cap that fits it for about five bucks. Any 16-18 lb cap that fits is within spec.

I'm assuming you are sure you have no air in the system. You bleed it by snapping the throttle a few times with the cap open.
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Old 08-18-2005, 01:11 PM
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Re: cooling problem

I've changed coolant last year and bleed it.
Now, I don't know ...
You think I could find a car radiator cap ? then it would be cheap ;-)
Which car ?
16 or 18 lb is the same as 16/18 psi ?
Then equivalent to 1.1 bar
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Old 08-19-2005, 07:22 AM
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Re: cooling problem

Check the radiator fan FUSE.
Lost that one also ones and temp going up hard in slow traffic. When it turns it should be able to cool down the water even when standing still.
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Old 08-19-2005, 07:46 AM
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The Honda testing standard for the stock cap is 16-20 lbs. Any 16 or 18 lb cap that is the right size will work. Take your old cap and match it to a car cap to save dough. If I remember correctly (an iffy proposition) Toyota caps are the same.
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Old 08-19-2005, 11:33 AM
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Re: cooling problem

ok thanks ;-)
I've checked one thing.
Starting the bike in the garage and waiting for it reaches 105C-221F, the expansion is beeing filled at mid level of its complete volume.
The fan starts today at 106C but it's a colder day and I don't have ride the bike.

Sounds like the radiator cap open too early no ?

radiator cap is stamped 1.1 (1.1 bar = 16psi), at which temperature would the cap open normally ?

Only the radiator cap can fill the expansion tank ?
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Old 08-19-2005, 12:18 PM
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Yes. If it vents that quick it is another indicator of a bad cap. Are you sure its on tight?
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Old 08-19-2005, 01:52 PM
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Originally Posted by jschmidt";p=&quot View Post
Yes. If it vents that quick it is another indicator of a bad cap. Are you sure its on tight?
Yep I check the rubber of the cap and retight it.
Coolant still flows at expansion tank at 105c.
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Old 08-20-2005, 02:45 PM
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Re: cooling problem

I've replaced the radiator cap by a "used" one. Cost me 5 bucks.

Seems that it works !
- The coolant now doesn't fill the expansion tank at 105 (level increase only very few)
- the hose that goes from the radiator cap to the expansion tank is not hot, telling me that no coolant is flowing here
- fan kicks up at 106C
- no "blublubblub" sound after several cooling cycles

Thanks a lot Jschmidt
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Old 08-20-2005, 07:02 PM
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My pleasure.
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