I had the same problem, replaced thermostat and still didn't fix it. What did fix it was simply a thourough coolant system flush and fill. It fixed the engine temp problem. They said there was air in the coolant lines. It also fixed a idle rev in cold conditions.
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Possibly a bad head gasket. If the water pump is good and the thermostat is ok then its the head gasket. Very expensive on this car since because it requires many hours of labor.It is a known issue with this motor.
This particular model suffers with head gasket problems. I have had to replace head gaskets on several of these vehicles to solve the overheating problem. The two cylinders in the rear of the engine are the problematic ones. The head gasket goes bad in that area which sends combustion gas into the cooling system. This then creates air pockets which in turn causes the engine to run hot. The air pockets then shift and as water starts to circulate again, the temperature goes back down. This cycle repeats over and over.
Solution is to replace the head gaskets.