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How do auxiliary coolant pumps affect the vehicle operation?

Auxiliary Coolant Pumps

Not all cars have auxiliary coolant pumps. Unlike water pumps, auxiliary coolant pumps are used to circulate coolant that is already warm to the heater core and sometimes to the batteries. The heater uses this fluid to help warm the air on cold days. If the auxiliary coolant pump isn't working right, your car's heater can cool off and may not produce warm air. While a primary water pump failure can result in your car overheating, an auxiliary water pump will not cause your car to overheat.