Same thing happened on my '02 Dakar. Replace the radiator cap, the springs are tired. On the F650 (and some other bikes!) it works like this: When the fluid reaches a specified temperature the cooling fan engages. If the fan fails or the temp reaches another temperature level the bike will emit a coolant overheat red warning light. If you continue to ride, the springs on the radiator cap will allow the fluid to escape into the expansion tank- when the tank is full a tiny hole on the removable black cover will spew coolant. When the springs are tired/old fluid will fill the expansion tank before the fan engages or the warning light is activated due to simple expansion of the coolant as it warms. In the Sudan the bike and I cruised through sand at temps exceeding 56c with no probs. The new radiator cap cost me 12usd. Safe roads.
Last edited by hook; 22 Jan 2010 at 13:51.
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