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A heat sending unit, often referred to as a temperature sending unit or sensor, typically resembles a small cylindrical metal component with electrical connectors at one end. It often has a threaded end for easy installation into an engine block or coolant system. The unit may vary in size and shape, but it usually features a simple design that allows it to withstand high temperatures and pressures. Overall, it is designed to accurately send temperature readings to the vehicle's gauge or engine control unit.

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