Re: Coolant light Off & On
This is one of my pet peeves: you can either buy a good Merc scan tool for $100-$150. Or you can randomly throw parts at it and will quickly get to the same amount. For $20 Torque Pro can tell you a lot but is limited to standard OBD-II elements and not the special codes that Mercedes uses.
Electrical and sensor issues, particularly intermittents, can only be found with either instrumentation & logging or luck. I prefer not to rely on luck