Shop › E36 Z3 M44 Serpentine Belt 350k4 Air Conditioning Idler. Image 1 of 3 Image 2 of 3 Image 3 of 3 E36 Z3 M44 Serpentine Belt 350k4 Air Conditioning Idler. $15.00 Serpentine Belt 350k4 Air Conditioning Idler Add To Cart Added! Serpentine Belt 350k4 Air Conditioning Idler