Engine 651 in model 900, 906 with code HK4 (Rear air conditioning, reinforced) for 2nd refrigerant compressor Engine 651 in model 906 with code H08 (Roof-mounted air conditioning system, reinforced) for 2nd refrigerant compressorar1321d0160we
ENGINE 651 in MODEL 906.657 with CODE PE4 (DCAA bus master code, Argen) for 2nd refrigerant compressor ENGINE 651 in MODEL 906.657 with CODE PE5 (Mastercode, bus seats on raised base, Argen) for 2nd refrigerant compressorar1321d1203ab