Sometims while driving my 2005 dodge grand caravan the temp. gauge goes up into red line then come down just as gradually as it went up. The car acts fine when this happens.
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Could be.. is the system FULL? Air in it can cause some odd things. When engine and coolant are COLD (as in after sitting over night), open the radiator cap. Top off the overflow res with a 50/50 antifreeze / water mixture to HOT mark. Start engine, turn heat to hot and fan to high. Top off RADIATOR with same 50/50 mixture slowly & gradually. As the coolant circulates, it should bring any AIR trapped in the system (from heater core & engine block) to the radiator where you can replace it with the 50/50 mix. Once the coolant is HOT and stays level - about an inch under the opening, close the radiator. Monitor the overflow res and add as needed. Good luck!
Could possibly need a new thermostat, the thermostat opens and closes depending on the heat of the coolant. maybe also check your heating core. as well as the quality of you coolant.
what motor do you have? have you change the thermostat lately? check the 2 hose to the heater core ,and see if they are hot. if only one is hot then you have a clogged heter core
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