Many times the vent fan's bushings(bearings) get full of dirt and lock up, then the thermal overload burns out. Check to see of he fan spins freely, if not take fan apart, clean bushings, oil, and good chance overload is fried. Use ohmmeter to see if overload is bad. The overloads on my fans are one shot deals, like a fuse.
I've wired in an external 3a fuse for my vent fans. The idea is for the fuse to burn out before the thermal fuse, when motor locks up due to dirt.
I also have a short cord on my vent fans, so I can get on roof in the morning, while cooler, remove the vent cover on roof, unplug cord, and pull motor out without getting in the attic and getting in the insulation.
4-5 years is about all I get on a vent motor without cleaning and oiling. I used to get my thermal fuses at Radio Shack which moved out of town.
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Today's Featured Article - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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