CONNECTION GOING NOWHERE??
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http://www.benzworld.org/forums/w203...iator-cap.html
It's only purpose AFAIK is to circulate hot coolant through the heater core when the engine is off. I don't see why it would throw any codes.





Whether the pump was ever there is the question.
It's an option code. In the US it's included, but perhaps not in UK.
It allows you to push the 'recirc' button on the dash when the car is turned off,
but the engine still warm, and blows heat at a low fan speed into the car for about 1/2 hour.




