What is a recommended step to reduce engine temperature during extended pumping?

Opening the auxiliary cooler is a recommended step to reduce engine temperature during extended pumping because it helps to manage and dissipate the heat generated by the engine. When the engine is under high load, such as during extended pumping operations, it generates significant heat. An auxiliary cooler increases the cooling capacity by providing additional space for heat exchange, thereby lowering the engine temperature more effectively.

Increasing engine RPM could potentially elevate the engine's temperature further, as the engine runs faster, generating more heat. Reducing the flow rate may decrease the workload of the pump, but it does not address the root cause of overheating in the engine. Turning off unnecessary equipment may help to reduce overall electrical load and some heat generation, but it is not as direct or effective in addressing the engine's cooling needs as utilizing the auxiliary cooler. Thus, using the auxiliary cooler is a proactive approach to ensuring that the engine remains within optimal temperature ranges during extended operations.