Thermostat: Service and Repair

Coolant Thermostat

Special tools, testers and auxiliary items required

• Refractometer (T10007)

• Drip tray (VAG 1306) or drip tray for VAS 6100 (VAS 6208)

• Torque wrench (5-50 Nm) (VAG 1331)

• Spring type clip pliers (VAS 5024A) or hose clip pliers (VAS 6340)

Removing

CAUTION!
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.

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

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

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

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

- Remove the bolts - arrows -, disconnect the connecting piece - A - and remove the thermostat.





Installing

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

• Replace the seal - item 17 - in => [ Seal ] Cooling System Components, Engine Side and O-ring - item 15 - in => [ O-ring ] Cooling System Components, Engine Side.

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





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

Tightening Specifications