One can be plagued with high temps with these cars for various reasons. Both my 240Ds were running a little too warm, finally did the right combination of cures and they've been doing fine. First check with one of those infra red heat sensors too see if its really that warm. I would try another OEM T stat, make sure the arrow is pointing up.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"