Hello my friend
I have a 57 reg vectra c gasoline z18xer and i have this problem whith my thermostat P0597-61 Coolant Thermostat Valve Stuck.
I change 3 thermostat and body of thermostat and still same problem.
At 95° the fan should open but i dont reach this themperature because the coolant is geting out is overheating and blow it outside.
On the body of thermostat is a sensor if i take the plug fan is running.
Down on radiator is another sensor if i take the plug i found a error open circuit.
I use opcom and think diag .
I dont no what to do next.
Can you help me ???
