ENGINE COMPONENT AND LOCATION 89 Drive Belt W2033321 1. EGR Cooler Outlet Pipe 6. Refrigerant Compressor (Pad Mount) 2. Fan Drive 7. Belt Tensioner (Fan Drive/Water Pump Belt) 3. EGR Mixer 8. Water Pump 4. Belt Tensioner (Alternator/Refrigerant Compressor Belt) 9. Venturi 5. Alternator (Pad Mount) 10. Differential Pressure Sensors Depending on the vehicle, the fan location may be high or low on the fan bracket. Two poly-V belts drive the front engine accessories. The outer, primary belt (10 or 12 ribs) drives the coolant pump and fan hub from a pulley on the crankshaft flange nested in the vibration damper.
The inner, secondary belt (six ribs), driven by the crankshaft vibration damper, drives the alternator and refrigerant compressor.