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Coolant temperature sensor: This sensor sends a signal to the engine's computer (PCM) indicating the temperature of the coolant in the engine, which helps the PCM to control the engine's fuel injection and ignition timing.
* Bypass hose from the water pump: This hose connects the water pump outlet to the thermostat housing, allowing coolant to flow around the thermostat so it can regulate coolant flow to the engine block and radiator.
