Coolant thermostat housing, disassembling and assembling

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2005 Volkswagen GTI, 2004 Volkswagen Jetta, 2004 Volkswagen GTI, 2003 Volkswagen Jetta, and 2003 Volkswagen GTI. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Routing coolant hoses to thermostat housing → Components of cooling system, engine side , Parts of cooling system, engine side.

Fig 1: Coolant Thermostat Housing, Assembly Overview

Courtesy of VOLKSWAGEN UNITED STATES, INC.

1 - O-ring

Replace if damaged

2 - Retaining clip

Check seated securely

3 - Thermostat housing

4 - Bracket

5 - 8 Nm

6 - Coolant thermostat

Observe installation position
Checking: Heat up thermostat in water
Starts to open at approx. 80 ° C
Ends at approx. 105 ° C

Opening stroke at least 7 mm

7 - Unions

8 - Seal

Replace

9 - Engine Coolant Temperature (ECT) sensor G62

For engine control module
With ECT sensor G2
Release pressure in cooling system if necessary before removing components
Checking: → 01 ON BOARD DIAGNOSTIC (OBD)

10 - Plug

Release pressure in cooling system if necessary before removing components