Cooling System: Description and Operation

General Information

Jetta from MY 05 through 10, Jetta SportWagen (US)/Jetta Wagon (Canada) for MY 09 and Jetta SportWagen (US)/Golf Wagon (Canada) from MY 10 => [ Draining and Filling ] Procedures


Hot steam may escape when opening the expansion tank cap.

• Wear protective goggles and protective clothing to prevent damage to eyes and scalding.

• Cover the cap with a cloth and open very carefully.


When doing any repair work, especially in the engine compartment, pay attention to the following due to clearance issues:

• Route lines of all types (for example, fuel, hydraulic, Evaporative Emission (EVAP), coolant, refrigerant, brake fluid and vacuum) and electrical wiring so that the original path is followed.

• To prevent damage to the lines, make sure there is sufficient clearance to all moving or hot components.

• When the engine is warm the cooling system is under pressure. If necessary release pressure before beginning the repair work.

• Secure all hose connections with hose clamps, for the correct allocation refer to the Parts Catalog.

• Use spring type clip pliers (VAS 5024 A) to installing spring clips.

• Always replace gaskets and seals.

• The arrows on the coolant pipes and coolant hoses must line up across from each other.