so i figured out a little more. I found a two wire sensor/switch near the upper radiator hose. If I ump across there the fans blow hard, on both cars. So new temp switches possably lower temps switch ???

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1993 W124 300D 2.5L Black 360k
1993 W124 300D 2.5L Silver 170k
and one semi retired
1984 W126 300SD 3.0L Blue 200k

SouthWest kentucky near Ft Campbell. If your from the area or know any good MB diesel mechanics in the area let me know.