Date registered: Sep 2005
Vehicle: 2001 E320, 'Lord Vader'
Location: Dallas / Ft. Worth Texas
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You know, last summer my car seemed to be running very much hotter than it is now, the only difference is that I've had the freon levels charged up. When I asked my mechanic about that he seemed to think that the second fan might not kick in as much if the freon levels were lower for some reason (actually I think it's the compressor that wouldn't kick in and hence the 2nd fan wouldn't run?) but now my car, all summer long, has never ran hot and that's the only thing that's been done, other than keeping MB coolant added to it as it needs it on rare occasions.
Best of luck in solving your problem.