LOOK THROUGH THIS WEBSITE, http://pages.prodigy.net/jforgione/MB_S500.html, FOR LOWERING ENGINE TEMPS. BASICALLY, YOU PUT A SMALL RESISTOR BETWEEN THE TERMINALS OF THE WATER TEMP SENSING SWITCH WHICH MAKES THE ELECTRIC FANS COME ON A FEW DEGREES SOONER THAN THEY NORMALLY WOULD. I DID THIS ON MY 400E AND IT WORKED GREAT. ESPECIALLY SAVES THE WIRING LIFE IN THAT HOT ENGINE COMPARTMENT.