engine, overheating. tempermental issue,

[billyfraser66]

Hi all i have tempermental overheating problem it not showing on diagnostic test it will overheat display on dash visit workshop
c180 2ltre t-model petrol w203 s203 02 plate
we were looking for problems yesterday possible coolant expanstion cap
we were looking for radiator fan switch but cant find one is there another way to test the radiator fan