Radiator Warning Light!!!!

[disco1]

Hi guys,
For a few days my yellow radiator warning light has been coming on. I have checked the fluid level and it seems fine, the engine temp is fine and is the engine in way of noise and performance.

The car had its inspection 2 at Rydale BMW a few months back

The car is a 318SE E46

Any ideas?

[blackspider]

Have replaced a few sensors over the years.Likely to be the fault.

Just to double check-the coolant level is with the float at its highest(silly,but I still get customers coming in and asking how to check it)