Lyle Knight
Member
This spring I bought a 930CK diesel. When I first tried to work it, it overheated. With some advise from this forum, I checked heads, seem ok, drained old coolant that was extremely rusty and flushed the radiator, installed new hoses, new cap, and thermostats. Here is the issue, rather than put new antifreeze in right away, I have been running straight water for about 10 hours use, then draining, flushing and refilling and repeating to get all rust out. The tractor runs about 195* on a warm day. Today I worked some summer fallow about 85* air temp, tractor ran about 200* on water. Drained water and it looked clean. I let the engine cool and topped off with 50/50 antifreeze and water. Went back out to dig and within an hour the tractor was 220-225* and pushing coolant out the cap. Why would it over heat with the antifreeze in it? Could the water pump be weak and unable to move the heavier antifreeze mix properly?