Hey guys, I've read every response to the "coolant visit workshop" problemand I am having this same problem, we have had everything checked, ie:fan,
Ecu and continuity of all the wiring to and from the fan, but still get
12 volts to it permanently, any suggestions, could it be the water pump
as this is probably the only thing we haven't checked, please help I'm going insane now, thanks

It's most likely the water pump. When the message comes on, does your temp go up a bit at all at low speeds? It may go up to around 100C and then jump back down to normal op temp. Check it out next time you're driving. If it does, then it's the water pump. I just replaced mine a couple weeks ago with these symptoms.

Temperature seems fine, anyways I'm taking it to an amg specialist
Later and hopefully they can sort it out once and for all