Bill

If your 240d is an early, pre "80", model they are prone to air trapped in the system. I put the front of the car up, make sure the heater valves are open, squeeze the upper radiator hose and try and "burp" the system while its running. You did open the 13 mm bleed nut on the T stat housing? right. I always wind up fiddling around getting the air out of my '78" and "79" but the later 240ds do not seem to have much trouble. Also I have gotten new bad T stats.

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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"