Thermostat: Service and Repair

Coolant Thermostat

• Checking the coolant thermostat, refer to --> [ Cooling System Components Overview, Engine Side ] [1][2]Cooling System Components Assembly Overview, Engine Side - item 17 - in part 1.

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)

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 cooling system. Refer to --> [ Draining and Filling ] [1][2]Cooling System, Draining and Filling.

- 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 escaping coolant can run into the engine.

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

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





Installing

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

• Replace the seal and O-ring.

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





• Fill the cooling system. Refer to --> [ Draining and Filling ] [1][2]Cooling System, Draining and Filling.

Tightening Specifications