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coast of Maine | I was having a fluctuating digital heat gauge on a JD 7410.Very rapid from ok to red zone then diving back to green.Was confounded as radiator was cleaned ,tanks of antifreeze correct levels.So I and local equip tech thought sticking thermostat? maybe..so before testing local JD had them in stock so we drained block back,put new ones in,,when we refilled it took 2 more gallons than drained,,,hmmm,,wtf..So some sort of air lock in the system ?Well we better check the thermostats in the learned on NAT way,,,worked slick,cycled them 2 x ,boiling to room temp,,changed position actually fast.We ran tractor hard all day today no temp fluctuation...now I also have some clean used thermostats.So have others had any air lock issue with a 10 series system?
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 IMG-5830 (full).jpg (129KB - 184 downloads)
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Boiling up Thermostats...
