The aux fan of my w124 230e 1992 is always on when the engine coolant T° is about 15 celcius degrees or more. When I unplug the coolant temp sensor (blue one on top front of the engine), the fan still keeps running, so I think it might be the relay located behind the fuse box.
But early in the morning, when the outside T° is about 10° celcius, the fan doesn't engage.
Maybe the relay hangs up only with certain amount of T°.
Or may be there is other device that I´m not aware of.
Is there any way to test this relay?... Could anyone put me in the right direction to solve this?
Any help will be appreciated.
Marcelo Mansilla Santiago - Chile