2 © 2001 2.5 Engine cooling Engine Description 1 Pressure oil line from engine to exhaust thermostat 2 Air line to exhaust thermostat 3 Exhaust manifold line 4 Exhaust thermostat 5 Control line to hydraulic coupling 6 Hydraulic coupling 7 Cooling fan 8 Cooling fan drive 9 Oil return line to crankcase 10 Ventilation line 11 Adjusting screw with special seal ring © 26 120 1 2.5.1 Amount of cool air regulated by exhaust thermostat