Quote:
Originally Posted by mbdoc
The engine fan is controlled with a PWM signal from the fuel system computer.
Any interruption in that signal wire causes the fan to run at full speed.
And yes, the T/stat can cause issues but not the fan to run wide open.
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Using a standard OBD-II code reader, I was ableto read code P0116 - Engine Coolant Temperature Circuit Range/Performance Problem.
That would seem to confirm the idea of either a bad sensor or a broken wire/connector.
Does any sort of diagnostic flow chart exist to help me fix this? What sensor am I looking for on a W204 sedan? Where is it located, etc?
Thanks for any help you can provide!
-David