Technician A says cooling system pressure is controlled by the radiator cap. Technician B says cooling system pressure is controlled by the thermostat. Who is correct?
A)A only
B)B only
C)both A and B
D)neither A nor B

Question

Quizplus · Accepted Answer

The radiator cap controls the cooling system pressure by maintaining a specific pressure; if the pressure exceeds the cap's rating, it allows coolant to escape to the overflow tank, thus preventing the system from becoming over-pressurized. The thermostat regulates coolant flow based on temperature, not pressure.

Technician a Says Cooling System Pressure Is Controlled by the Radiator