Where is the Audi a4 heating pump?

Engine compartment. According to car home official website, Audi A4 warm air pump is located in the engine compartment. The function of the hot air pump is to circulate the coolant in the cooling system to the hot air radiator to heat the car. If the heater pump fails, the heater system will not work or the heating efficiency will decrease, so it needs to be repaired or replaced in time.