Sorry if this is stupid question and if it may have already been asked, but I am new. I have a Vulcan 800 and the fan does not come on any more. I crossed the leads coming out of the switch in the radiator and the fan worked, so it is not the fan. Is it the switch that comes out of the radiator or can it be because it is low on antifreeze? Could it be anything else? Can you use a 50/50 mix, Iam sure it is low. Thanks.