wow...a bunch of excellent suggestions! Thanks to all. I'll head home tonight and try them all. The rad cap looks ok, but I've never replaced it so it might be time. Not sure about the fan clutch - the fan seems to run ok, but I'll try turning it by hand as Larry suggested... I'll let you know how it goes...
2007 E550 4Matic - 61,000 Km - Iridium Silver, black leather, Sport package, Premium 2 package
2007 GL450 4Matic - 62,000 Km - Obsidian Black Metallic, black leather, all options
1998 E430 - sold
1989 300E - 333,000 Km - sold
1977 280E - sold
1971 250 - retired
"And a frign hat. They gave me a hat at the annual benefits meeting. I said. how does this benefit me. I dont have anything from the company.. So they gave me a hat." - TheDon