Coolant Thermostat

Coolant Thermostat

• Checking the coolant thermostat, refer to item 17 in => [ Coolant Pump and Thermostat Overview ] Coolant Pump and Thermostat Overview, part 1, belt pulley 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

The coolant system is under pressure when the engine is warm.

Risk of scalding due to hot steam and hot coolant.

Reduce pressure by covering the coolant expansion tank cap with a cloth and carefully opening.

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

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

- Remove the intake hose - 4 - between the throttle valve control module (J338) and air filter. To do so, disconnect the hose - 1 -, if present, and the hose - 2 - (compress the securing ring) and remove the spring clamp - 3 -.






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

- Insert the guide tube for oil dipstick into the cylinder block again and secure it 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 -, disconnect the thermostat housing cover - 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 (item 18) and O-ring (item 16) in => [ Coolant Pump and Thermostat Overview ] Coolant Pump and Thermostat Overview, part 1, belt pulley side.

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






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

Tightening Specifications