or your switch that lives in the radiator tank has become loose, does this to me all the time......go to the wreckers and by yaself a new one (assuming you have heaps of coolant still in there) If no coolant, say hello to a new headgasket!
haha, thanks to that light it has made me aware that i have a cracked head. I go through water ever 2-4days, fully pressure tested. the most likely reason is that one of the galleys in the head is cracked and is leaking water into the pistons.. the heat just evaporates it and it leaves as exhaust
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