Thermostat: Service and Repair

Coolant Thermostat

• Check the coolant thermostat => [ (Item 17) Coolant Thermostat ] Cooling System Components Overview, Engine Side.

Special tools, testers and auxiliary items required

• Refractometer (T10007)

• Drip Tray (V.A.G 1306) or Drip Tray for VAS 6100 (VAS 6208)

• Torque Wrench (5-50 Nm) (V.A.G 1331)

• Spring Type Clip Pliers (VAS 5024 A)

Removing


Hot steam may escape when opening the coolant 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.

- Drain the coolant. Refer to => [ Draining and Filling ] Procedures.

- Remove the engine cover with air filter. Refer to => [ Engine Cover with Air Filter ] Engine Cover with Air Filter.

- Remove the intake manifold. Refer to => [ Intake Manifold ] Intake Manifold.

- Insert the guide tube for the oil dipstick into the cylinder block again and secure it tightly so that no leaking coolant can run into the engine.

- Place a suitable container under the coolant thermostat housing to catch coolant leaking out.

- Remove the bolts - arrows -, the cover - A - and the thermostat.






Installing

Installation is performed in the reverse order of removal. When doing this note the following:

• Replace the seal => [ (Item 18) Seal ] Cooling System Components Overview, Engine Side and O-ring => [ (Item 16) O-ring ] Cooling System Components Overview, Engine Side.

• Note the installed position of the thermostat - 1 -, the valve - 2 - must point upward.






• Fill the coolant. Refer to => [ Draining and Filling ] Procedures.

Tightening Specifications