The 300D n/a has a higher rear end than the turbocharged so expect it to rev 3000 rpm @ 60 and 3700 @ 75, flairing is useally low tranny fluid or it's tome for a tranmy oil and filter change, these cars has 4 gears, it starts at 2 nd gear b/c it suppose to save fuel.... And also back then highway speed limit was 55 mph and the cars engine rpm = +- 2500 Rpm. As far as climate control they are probally the worst type ever placed in a Mercedes I would jury rig it if it dose not work

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Current Garage
2008 Mercedes GL320 CDI 188k mi Repair/Work in progress
1994 S350 160k mi Garage Queen & prepping for repairs
2005 E320 CDI 203k mi Healthy & Daily Driver
1994 S350 357k mi Retried as parts car
1984 300TD 214k mi Blown OM617 Poss OM603 Swap??

Sold
1987 300SDL 200K+
1994 S320 181K mi
2008 E320 Bluetec 127k mi
1999 S420 130K mi
1980 240D 360k mi
15+ Others that has come, stay and gone

GONE, BUT NOT FORGOTTEN
1995 E320 SE 220k mi
1984 300SD 350k mi