Genuine Bosch Aux Water Pump 039202401E

An electric heater pump in a car is an essential component that helps to regulate the temperature inside the vehicle. It works by drawing heat from the air outside and transferring it to the interior of the car. The pump has an electric motor that drives a compressor, which compresses a refrigerant gas, raising its temperature.

The heated refrigerant gas is then passed through a condenser, where it releases heat to the outside air. Once the refrigerant gas cools down, it flows through an expansion valve, which lowers its pressure and temperature. The cooler refrigerant gas is then circulated through an evaporator, where it absorbs heat from the air inside the car. Finally, the heat absorbed is blown into the cabin using the car's ventilation system, effectively heating the interior and keeping passengers warm and comfortable during colder weather conditions.