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Ford Explorer Community - Maintenance - Modifications - Performance Upgrades - Problem Solving - Off-Road - Street
Explorer Forum Covers the Explorer ST, Explorer Sport, Explorer Sport Trac, Lincoln Aviator, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Ford Aerostar
what are you refilling it with? if you keep putting tap water in there every day you are going to build up minerals that will plug everything. use only distilled or R.O. bottled water with at least 40 % antifreeze. and dont mix the types of antifreeze or they will crystallize also. thermostats can go bad at any time but usually after an engine is over heated. but usually when they quit they just stick open or usually closed and that is it. it sounds like you could be letting it get to low and getting an air lock somewhere.