Re: Cooling fan
sorry beg to differ on cars and bikes being the same. My modern car has a completely pressurised system (unlike my bike) where the rad only has a plug not a pressure cap which is instead located on the remote expansion tank. This tank is, importantly, only half full so as the system heats up the coolant expands to occupy more space in it and consequently increase system pressure. The pressure cap remains closed at all times unless there is overheating and the system pressure rises too much when excess coolant is dumped to atmosphere via a hose......
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