The auxiliary cooler valve is designed to:

• A. Control the temperature of the coolant in the apparatus
• B. Increase pump RPM
• C. Adjust priming time
• D. Control the discharge flow

Answer: (A)

The main idea here is regulating the engine’s coolant temperature. The auxiliary cooler valve directs coolant flow through an auxiliary cooling circuit when the engine is getting hot, helping to dissipate heat and keep the temperature within safe operating levels. When the engine doesn’t need extra cooling, the valve can bypass the cooler to avoid unnecessary cooling and pressure loss. This function protects the engine during demanding pump operations. It doesn’t change pump RPM, nor does it adjust priming time or directly control discharge flow, which is why coolant temperature control is the best fit.