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=== Engine temperature exceeds normal operating range, fluctuates erratically, or overheats ===The thermostat is a critical part of the cooling system that fails the most frequently. Thermostats are cheap, and when they fail they tend to be sluggish to open causing the engine temperature to exceed normal operating range, sometimes up to 240 degrees and in other cases the thing will stick closed and cause the engine to overheat. # Thermostat# Low coolant# Water pump# Other possibilities include low oil, bad engine, etc...