Looking for some help, driving yesterday and after about 30 mins the coolant light comes on and I notice the temp dial goes from 90 to 120 and back again in about 20 secs. Does this a couple times so I pull over, expansion tank level looks low and water has obviously sprayed somewhere up high as pipes around tank are wet. Did it again today although the tank level does not look as low? No water in oil or oil in water. Could it be a defective cap releasing pressure causing the temp swings? If the cap releases where does if release from? Could it be the tank? I know there is a lot of info on the possibility of water pump and EGR cooler but I am confused as to why the tank would release into the engine bay?
It is a 2010 T5.1 Multivan 2.0TDI 132kW
It is a 2010 T5.1 Multivan 2.0TDI 132kW
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