Posted by K Effective on January 02, 2021 at 06:29:33 from (99.184.108.123):
In Reply to: silly question?? posted by venuschild1968 on January 01, 2021 at 15:07:27:
Rest assured, there are no silly questions. There is a ton of experience here, so your questions may seem silly to some, but to you, they are your reality.
I would start the tractor with the cap removed and let it run at mid idle, watching the fluid in the radiator. Put an empty bucket under the radiator just in case it does overflow. Once you see a change in the flow in the radiator, or air being released, or if the liquid swells and seems constant, just install the cap carefully or shut it off and let it cool first.
A stuck-closed thermostat would cause the motor to heat higher quickly without transferring the heat to the radiator, not likely to cause your summer issues. A stuck-open thermostat will allow coolant flow to the radiator all the time, thus cooling more than you would want, also not causing your summer issue.
But a system not holding pressure, due to a leak, will boil at a lower temperature than a pressurized system, especially one with below-average coolant mix. That sounds like your summer issue, and should be found with a pressure test tool, which you can rent for free from O'Reilley and AutoZone.
Unfortunately, coolant can leak in weird places on a 50-year-old tractor. Look for signs of water in your oil or hydraulic fluid, usually a milky white/tan goo on the dipstick or cap.
Lots of these guys have far more experience with your specific tractor than I, and I'm always willing to learn from them. Well, most of them, that is...
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