Here in Florida, a 99 with those miles and working a/c go for 8-10k.
So if you can get it at 6-7k and you do the work, you should be good. If you can get it for 5k, nice. But I wouldn't walk away from it at 6k.

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1979 240D Caledonia Green/cream gone
1982 240D stick Ivory/Palimino
1999 E300D White/grey