During engine warm-up, when the thermostat is closed, _____.
A)coolant flows through the radiator
B)coolant flows through the bypass passage
C)both A and B
D)neither A nor B

Question

Quizplus · Accepted Answer

During engine warm-up, when the thermostat is closed, coolant does not flow through the radiator. Instead, it flows through a bypass passage that allows the coolant to circulate within the engine block and heater core, helping the engine reach its operating temperature more efficiently.

During Engine Warm-Up, When the Thermostat Is Closed, _____