Surprised the Centre didn’t immediately identify problem, it is rather fundamental. Vacuum is shared between exhaust valves and cooling system valves. Exhaust vacuum open, cooling system loses its vacuum activation as well.
I had the exhaust tube come loose on an Anglesey trackday and drove back to Devon with coolant CEL error, but I monitored coolant temperature it all the way back on a OBD/iPhone linked diagnostic app. This also showed how the dash temp is always 90 when in a norm operating range.
I had the exhaust tube come loose on an Anglesey trackday and drove back to Devon with coolant CEL error, but I monitored coolant temperature it all the way back on a OBD/iPhone linked diagnostic app. This also showed how the dash temp is always 90 when in a norm operating range.