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Lapel, In | Probably an air lock. Back when we were installing a lot of Hiniker and Year Around cabs, it was sometimes a trick to get the air out the system. Remove the return heater hose and let the tractor run. The coolant should eventually come on through. And by the way, water pumps neve build pressure. It is only from the expansion of the coolant that pressure is built. That is why an air lock can be so troublesome to get out if the heater core is mounted up high. | |
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Coolant flow question need help
