coolant warning light

[jimbob29]

coolant warning light came on in my 320i after sitting in traffic for the last hour so i immediately checked coolant and it was still full. the temperature gauge never went over half either?thers no leaks or trapped air in the system ?.warning light has not came back on since restarting car.anything i should check when car has cooled down?

[capri_rob]

You mean the light on the "check" panel overhead yes ?

Just keep an eye on it - I've had to replace a couple of the sensors in the expansion bottle that have been tempramental by putting the light on when it was still full of coolant.

If the guage is working normally I wouldnt worry too much about it.

[Brianmoooore]

The centre stalk of the sensor contains two very fine wires, and when coolant eventually finds its way into the stem, they will rot through, putting the light on.
New one is around £9 from Eurocarparts through meatballs, and is well worth replacing. This sensor tells you that your engine will shortly self destruct, if you don't stop, unlike the temp. gauge, which tells you it HAS just self destructed.

[jimbob29]

were should the coolant be sitting when cold?i cant see any fill level marks on the tank?

[capri_rob]

There is definately a fill level mark on the tank