Either the fan motor or the sensor needs to be replaced. or your thermostat is stuck.
Temperature.
There's a coolant temperature sensor located on the lower part of the water pump on the drivers side.
You may be low on coolant. You may have the wrong temperature thermostat in it.
240 up
behind the thermostat housing,two wires
One the engine block on the 302 and 351's
It is screewed into the intake manifold right beside the thermostat housing.
It has 1 coolant sensor, 1 temperature sensor
What size engine? on my 1993 2.5 it is direcly behind the coil on the front of the engine.
were do I put coolant in mercedes 1994 c280
The coolant temperature sensor screws into the bottom of the radiator, and has two wires connected to it which have a quick relese plug....piece of cake
The light you are describing indicates low coolant level in the coolant reservoir.