Overheating but no high temperature reading
Hi everyone, I need your help!
I was just stuck in a slow moving traffic jam in my 2004 111S. My temperature stayed really low (on the gauges at least)
But then I suddenly saw steam coming from the rear. Put it at the side of the road and noticed my coolant boiling in the overflow tank, and almost completely draining it. Strange thing was though that the car said the temperature was at 80 Celsius.
Let the car cool down, refilled the overflow tank, and carefully drove the car home. Didn't overheat anymore, and all the coolant stayed in the tank. Strange thing was though that it didn't read any temperatures for the rest of the 15 minute trip home. (Either temperature stayed under 70 or something else..)
What do you think it could be? Broken coolant temp sensor? Broken thermostat? I'll be changing the pressure cap of the overflow tank, but that alone couldn't have caused all the problems!