They checked the fan belt and found visible wear and slack consistent with slipping under load, not driving the fan at full speed when the engine needed it most. They checked the thermostat and found it opening later than the shop’s usual check called for, holding coolant flow back right when the engine was working hardest. Neither problem was dramatic by itself. Together, on top of a radiator that had just barely been keeping up even after repair, they were enough to explain the lingering warm readings.
Nothing pointed to the water pump or the pressure cap, so those were left alone. Otis replaced the belt and the thermostat, both inexpensive next to a radiator, and they ran the tractor again under a comparable cultivating load in the afternoon heat. The temperature held steady in the normal range through that day’s work.
“That’s the difference between fixing a radiator and fixing a cooling system,” Otis said. “The radiator was part of the problem. It was never the whole problem.” Malik didn’t forget that.
He rebuilt his process for the rest of the pile from the ground up. Every unit went through pressure testing first. Anything that passed moved to a visual check of the fins and core for debris or damage, since some problems could be ruled out or cleared right there in the shop. Anything where restricted flow was suspected went to the radiator specialist for real verification, not a shortcut guess.
Units with real internal blockage or damaged cores that the specialist judged repairable were set aside as recore candidates. Units too far gone—cracked tanks, crushed cores, corrosion beyond saving—went to true scrap. By the time he’d worked through the whole lot, the 70 radiators had sorted out to something closer to a dozen dependable exchange candidates once cleaned, tested, and in some cases professionally recored, a smaller handful still waiting on the specialist’s word, and the rest split between honest donors for parts and straight scrap, no better and no worse than what Kurt would have gotten for them from the start.
That sorting mattered sooner than Malik expected, because July wasn’t finished with the county yet. An older farmer named Wallace Boyd pulled into the shop one blistering afternoon with his tractor’s temperature gauge climbing fast in the middle of hay work, the kind of heat where every delayed hour meant cut hay sitting in the field risking rain.
“So which radiator you putting in?” Wallace asked, already assuming. Malik didn’t answer that yet. He and Otis went through the system first, the same way they’d learned to on Gene’s tractor. Pressure and fitting condition. Fan and belt. Thermostat behavior. Cap and coolant condition.
The belt was worn nearly through, slipping badly under load. The radiator itself showed no leak, no restriction the shop-level checks would flag, nothing that pointed toward it being the failure. “You don’t need one of mine,” Malik told him. “Your radiator didn’t fail the test. Your belt did.”
Wallace looked skeptical, standing next to a shop wall stacked with radiators he’d figured Malik was itching to sell. “You’ve got 70 of these back there, and you’re not selling me one?” “You didn’t need one,” Malik said.