7.3 Oil Cooler

The oil cooler used on some models is an oil-to-coolant heat exchanger. Engine oil flows through one part of the cooler and gives up heat to the engine coolant flowing through the other part of the cooler. The cooler is a potential source of leakage between the lubrication system and the cooling system, and should be considered whenever such leakage is suspected.

Fig. 7-6 is an exploded view of the oil cooler, the oil filter, and the mounting parts. Remove the oil cooler only if it needs to be cleaned, inspected, or replaced. On installation, use sealing paste, Volkswagen part no. AMV 188 100 02, on the sealing surfaces and check to see that there is adequate space for the coolant hose connections. Torque the oil cooler mounting nut to 25 Nm (18 ft. lb.).

Fig. 7-6.

Exploded view of oil cooler and related parts used on gasoline and diesel engines, except 16-valve. 16-valve engines are similar. Inset shows filter flange with oil line used on turbo diesel engines.