I have heard that "if you can hold the upper radiator hose w/o discomfort its NOT to hot" I have pulled over a couple of times when I thought she was a little hot and used that test.

BTW my gauge needle used to jump around now and then. I changed the temp senors and that fixed that.

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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"