cooling problem
Today I returned to home. It was a warm day.
Riding in town, the temperature increased to 110°C = 230°F. The fan did not start. When I reached home, the temperature increases to 112°C = 233°F 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 112°C-230°F. I waited until temperature decreased to 110°C (230°F) and restarted the bike. The fan does not started until it reached 112°C (233°F) and then started. Then temperature decreased to 110°C (230°F) then fan stopped and the temperature reincreased to 112°C (233°F) then fan restarted and so on. Usually, the fan starts at 108°C-226°F (that is high my taste) but today, it started at 112°C-233°F 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" |
Consider replacing the radiator cap.
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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 ? |
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. |
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 ? :oops: Then equivalent to 1.1 bar |
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. |
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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Re: cooling problem
ok thanks ;-)
I've checked one thing. Starting the bike in the garage and waiting for it reaches 105°C-221°F, the expansion is beeing filled at mid level of its complete volume. The fan starts today at 106°C 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 ? |
Yes. If it vents that quick it is another indicator of a bad cap. Are you sure its on tight?
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Re: cooling problem
why dont you just jumper the thermostat switch and turn it on all the time?
We do that all the time,this is a warm climate down here,mine its still not jumpered but I will do it. Now that we are talking temperature,when I ride,highway,at spirited pace the temperature is around 180-190F,but whan I race my piece,it goes up to 215-218 at full pace,I thouh they were suposed to cool better at hi speed,but it seems there is one hell of a good work load on the engine when its pushed.Anyone has experience about this? |
Originally Posted by jschmidt";p="
(Post 9581)
Yes. If it vents that quick it is another indicator of a bad cap. Are you sure its on tight?
Coolant still flows at expansion tank at 105°c. |
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 106°C - no "blublubblub" sound after several cooling cycles Thanks a lot Jschmidt ;) :D |
My pleasure.
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