1997 ford expedition overheating problem
truck warms up fine heat works good then heat goes cold and temp gauge jumps from normal to overheating i have changed the thermostat twice water pump fan clutch...
This might sound like too simple a solution, but after owning 5 expeditions, I think I may have an idea.
It is possible that the cooling system is simply not full of fluid. If, when changing the thermostat twice and other service, the system was not sufficiently bled or burped, this can happen. What happens is that people do these repairs, and then fill the radiator, but fail to completely flush the cooling system. My son had the exact same problem on his Mazda 3 (Mazda was owned by Ford then), and flushing his cooling system solved his problem.
Think of it this way: If your heater works fine, then goes cold, that usually means the heater coils which the air blows over have no hot fluid in them. As for overheating, your thermostat opens when your engine reaches a certain temperature with the intent to exchange the too-hot fluid with water cooled by the radiator, but if there is only air, or insufficient fluid in the engine after the exchange, you will overheat.
Ask your mechanic to flush/burp the cooling system completely. I hope this works.
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