The 500SE wasn't offered in the US so that car wasn't built to US specs. The chassis number will tell you what it is. It's probably part of the VIN which will be something like WDB12603612xxxxxx. If that's the case, you won't be able to check it in Carfax.
The blower problem could be anything from a loose wire to a bad motor and controller. Did it have ACC or rotary controls for the AC?
If the window motor makes noise, it probably just needs a <$10 sliding jaw or a not-so-expensive-because-you-can-get-a-used-one regulator.
There's usually an antenna switch on the dash that controls how high it goes.
I don't know about the whistle. Maybe it has a turbo