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The reset button is usually an easy one - I'd guess at some point the Instrument cluster has been removed - the three buttons on the side are connected by a small ribbon cable on the rear of the cluster (held in with one of the computer type ribbin cable locks) - I'd hazzard a guess that the ribbon cable has come loose, or wasn't put back in properly
Pretty easy to remove the IC and check this ... (have a search on here...)
I'll try and snap a pic of my old AMG cluster later
The coolant temperature sensor hooks into the front SAM - it could be a loose connection here , or on the sender it's self
This Youtube vid shows the sensor being changed out on a C class, but with the same engine as yours...
I think (at least on older motronics) the ecu assumes 0c on startup and 100c after some period of running if it can't acquire a signal from the temp sensor. I just repaired a temp sensor on Jr's Volvo where the connector had gone bad due to age and heat. So check that first!