Thanks Mike, good thread.
I had previously removed the rad and washed both sides, I also blew it clean and dry with compressed air - it was quite dirty. I didn't do the AC condensor. Upon inspection yesterday, my mechanic pointed out how dirty the condensor was.
I'll remove the rad again and clean the condensor fully - including removing the aux fans. If that doesn't fix the problem, I'll install the new (used) clutch. If that doesn't work it's time for a new rad and a new lottery ticket...
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