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981 CS Coolant System Alarm ... unexpected outcome !

ralphmusic

PCGB Member
Member
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.

 
On a recent late evening run out, Amber alarm ... Coolant System Fault - visit garage.

Torch in hand, checked under the car ... no visible leaks so returned home ... without issue.

Next morning ... fluid level OK so another check underneath ... again, no leaks but the vacuum hose connection at the nearside PSE valve actuator had sheared ... is this related ?

Discussed / booked in with OPC service dept ... still none the wiser. Come the investigation / repair it appears that the the failed connection causes an open circuit in the coolant alarm system ... go figure !

I have trawled the PET file but have yet to find a visible hardware link between the two systems.

The failed connection was due to the actuator port / nozzle shearing from the body, a new actuator was fitted and the original hose reconnected (all covered under warranty).
 

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