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Congrats on the purchase, they make very nice vehicles. Not that this is really the spot to put questions, but here are your answers;
I don't quite understand why Fastlane would list something for the front windshield seal for a 83 like mine but not for a 82 like yours. I never noticed if the pre83 W123s had a different trim around the windshield but I'm sure someone here may have a better answer for that. I don't recall offhand anyone really doing the front windshield themselves but I do recall several people replacing their rear windshield seal. It is about a 2-3 hour project and is quite helpful to have a second person.
It is a part that you'll just have to succumb to your dealer for, they will use your VIN and key it to your car. Last I heard it costs somewhere around $90 for a new tumbler keyed by MB, you can actually get a blank version for around $30 at parts places like FastLane, but again it isn't keyed to anything specific. I've talked to a locksmith or two in hopes of getting a spare tumbler but they refused to touch it, they seemed a bit sore at the fact mercedes doesn't share any information with them.
Which fan are you referring to? The engine fan is ran on a clutch that once the fluid hits a certain temperature it kicks in, sounds quite a bit like a turbine going. It has to be running quite warm for this to happen, probably near 100*C if not in excess of. The second fan is the fan for the A/C, it is triggered by that system unless the car is in risk of overheating. It sounds like your thermostat is working well, if it drops below 80*F while driving it normally means it is a weak spring but it sounds like yours is in the ideal spot.
That is very poor mileage, have you noticed anything inherently wrong? Excessive smoke during normal acceleration? Any fuel leaks? Have you checked the brakes for drag? Have you tried any sort of injection system cleaner (like diesel purge)?
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