[toycrusier]

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.