When he replaced the T-stat, that could have cured the over heating problem but if the air was not purged out of the system after the t-stat replacement that could be causing the problem now. Usually with the "later" 240Ds (his) air in the system is not a problem with only a T- stat change. 84C is proper running temp, but 100 is OK above that (except up hill) there is a problem in the system.
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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"
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