Originally Posted by
M SL 65
I have have read all the existing posts at least twice. Not meaning to be flippant.
The light is really slow to come on - an eight count.
I have topped up the overflow tank.
I have replaced the overflow tank sensor.
I have remove and flushed out the overflow tank and yes the floating magnetic ball rattles.
I have replaced the temperature sensor.
The fan runs when the car is warmed up.
The fan runs when the A/C is turned on.
.
ARe you really saying that everything is fine except the light comes on just after starting the car? That is:
1) WIth no A/C on and a cold engine, the fan does not run.
2) The fan runs when the engine is getting warm OR when the A/C is on.
I am assuming the coolant module is in tune with the ECU??????
If you mean the Fan Control Module, it and the ECU carry on a conversation on the PWM wire running between the two.
In any event, it sounds to me like you have a bad coolant level sensor. But I can't say for sure.
I also offer the attached...