Technician A is correct about engine overheating due to a closed thermostat, while Technician B is incorrect.
Technician A is correct. A sticking or stuck closed thermostat can result in engine overheating by restricting the flow of coolant, leading to increased temperature. Conversely, Technician B is incorrect as a stuck open thermostat can cause the engine to run below optimal temperature, affecting performance but not necessarily overheating.
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