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try replacing the radiator cap, because it has a pressure release valve that can stick or take out your thermostat altogether, sometimes it runs better without it in the summer only. . HOW IS THE CONDITON OF THE RADIATOR? THERE COULD BE SOME CROSS TUBES THAT ARE CLOGED UP TOWARD THE BOTTOM THAT CAN NOT BEE SEEN. I TEST THIS BY PLACING MY HAND ON THE FACE OF THE RADIATOR AND TRY TO FIND COOL SPOTS.

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Q: WHy is my 350 momentarily overheating then after a quick stop it dropsback to normal after I Replaced intake man gasket i then replaced rad andhoses thermostat and fan clutch could it be the waterpump?
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