The ACM Heater Core (528i 540i M5) - 01754017 is a replacement heater core for BMW 528i, 540i, and M5 models. It is designed to fit and function just like the original equipment, providing efficient heating for the interior of the vehicle. The heater core is responsible for transferring heat from the engine coolant to the cabin of the car, ensuring a comfortable temperature for the passengers. This product is made with high-quality materials and undergoes rigorous testing to ensure durability and performance. It is an essential component for maintaining a functional heating system in the vehicle.