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I deliver Meals on Wheels once a week and the route I take requires me to climb a very steep hill. Everytime I go up this hill it over heats. I replaced the thermostat and can see that the water is circulating and the reservoir is at the proper level. As soon as I get back to level ground the thermostat goes back to normal and I can drive all week without it overheating again. Next week, same thing all over again.
What could be the problem? Someone told me it must be a Florida car.
 

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Could be the brakes are dragging; or if it's an automatic, a slipping transmission can overheat and transfer that heat to the engine cooling system. Try downshifting the next time you climb it.
 

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FWIW - My '02 LE 5sp used to overheat under load all the time. Long story short: it turned out to be a minute crack in the water inlet pipe which is actually made of a plastic type of material. Nothing I look at would disclose that fact. But it was an inexpensive repair and hasn't happened again sense replaced.
 
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