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More than likely the thermostat is stuck closed or staying closed too long. If it is truly stuck closed, coolant will overflow out of the the reservoir tube as the engine begins to overheat, however if it heats up and sometimes cools off the thermostat could be failing.
The thermostat is located beneath the waterneck where the upper radiator hose connects atop the engine. Two bolts will remove the waterneck. Expect 1 pint or more of coolant to backup through the opening when removed. Drain some of the radiator using the drain plug on the bottom of the radiator, or put a large drip pan beneath the car, expecting the engine to get wet. FOR THE LOVE OF ALL, do not let the distributor get wet...its on the front of the motor beneath the water pump.
Additionally, there is an airdam affixed to the underside of the front bumper. This acts a diverter for the flow of air into the radiator. If this piece is severely damaged or removed, the radiator will fail to cool the engine properly.
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