engine cooling

Hi. My W210 E320CDI (2001) is running hot (90 degrees to 100 degrees C); also the h/p diesel fuel pump has started dripping fuel. Any ideas on temperature problem and approx cost for replacement fuel pump?

found a loud ratttle in a unit at the top front of the engine, looks part of the cooling system connected to the radiator top hose. what is this unit? is this likely to be a costly repair? assume water pump behind centre pulley... any help appreciated, trying to save my te from the scrap...