Wife's S-10 Jimmy started doing that after a few years and after the 100,000 mile mark. Didn't mater that the water pump was changed, the rad flow verified. Tried four different brands of thermostats that were correctly installed. Even drilled a vent hole in them if there wasn't already a vent. Each stat over heated the engine then suddenly the engine would run too cool at light loads and too hot at high loads. Every stat removed was found stuck about 1/3 open. Even after an engine rebuild when it was running on 5 cylinders due to a stuck lifter after an Quick Lube oil change. The engine kept over heating with a new stat . And the stat would later be found stuck 1/3 open. Still did it after the 2nd rebuild after the rebuilder used the wrong balancer shaft bearings. All block, head and pump coolant passages were verified open. I was about to just pull the stat and run an electric cooling fan set to start at 210F. However it cracked a piston and vehicle was scraped. Hence my belief that getting rid of an old worn machine and purchasing new or newer is cheaper in the long run. If indefinite repairs were cheaper. Trucking companies would still be using 1970's and 80's vintage tractors.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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