Question about Honda VT 500 C Motorcycles

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I have a Honda Shadow VT500C 1986. Last time I rode it, the temperature needle went to the red and when I stopped to check if everything was ok, I saw that coolant was getting spitted and boiling. I checked the fan and it was not on, although I checked that it was able to turn freely. So I have a few questions: Is it likely it is the fan? or the waterpump? or the thermostat? How do I check all of these? And now that my cooling system is likely to have air in it, how do I fill it up properly? Thanks a lot for your help!!

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raj somaiya

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The fan is designed by Honda to come on just as the needle touches the red zone, or just slightly before it.But if its not coming on then its problem with fan.It should come On.You can provide 12 volt to fan connections directly by external battery source and see, if fan starts and runs directly.If the fan runs by external 12 volt source then its problem with fan controlling relay under seat.But if fan is not running by external 12 volt direct source then its problem with fan and needs to be replaced.---------- But if fan checked out ok and fan relay looks fine and checked ok, 12 volt by meter, then its problem with thermostat.------ The thermo-switch that operates the fan is on the bottom of the radiator and the thermo unit for the gauge is on the side of the thermostat. The fan does not turn on until the coolant in the bottom of the radiator is up to a certain temperature. The coolant can be hot at the thermostat and much cooler at the bottom of the radiator.

You may want to drain the coolant and look inside the top of the radiator for corrosion or anything restricting the coolant flow. If it looks dirty, take the radiator off and take it to a radiator shop to have the inside cleaned.------------- Once the rad is completely flushed cleaned the coolant has to be refilled.------- This will help.Thanks.Helpmech.

Posted on Aug 20, 2011

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