Why does the car air conditioner make a thumping sound?

[JayceFitz]

Car air conditioner thumping sound may be caused by the compressor belt making noise, or it could be the tensioner pulley of the compressor belt making noise. The compressor is a crucial component in the air conditioning system; without the compressor, the air conditioner cannot provide cooling. The car air conditioner is an important comfort feature in a vehicle. Air conditioning cooling principle: After pressing the AC button, the compressor clutch engages, and the engine drives the compressor to rotate. This way, the compressor can continuously compress the refrigerant and deliver it to the evaporator. The refrigerant expands and absorbs heat in the evaporator, cooling the evaporator. The cooled evaporator then cools the air blown by the blower, allowing the air conditioner vents to blow cold air.