Operation CHARM: Car repair manuals for everyone.

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.