Water temperature sensor, thermal switches (VW Golf 2)

Contents: Engine 1.1 and 1.3 ↓ Engine 1.6 and 1.8 carburetor ↓

1. Draining the cooling system is not necessary if a plug is available, such as an old temperature sensor or a rubber plug. First, remove the pressure in the system by unscrewing the plug in the equalizing tank. If the liquid is hot, be careful. After the increased pressure has been removed, tighten the plug.

2. The position of the coolant temperature sensor and thermal switch depends on the engine type, but it usually looks like this.

Engine 1.1 and 1.3

3. Thermal switch: located in the central tube between the drive manifold and the thermostat housing. Controls the pre-heater in the drive manifold. When the liquid warms up to a temperature of 35°C, the switch turns off the heater.

4. Temperature sensor: located in the thermostat housing 3 (figure 2.4).

Figure 2.4. Cooling system - 1.1 and 1.3 l engines
1 - thermal switch 2 - gasket; 3 - thermostat housing; 4 - gasket; 5 - thermostat; 6 - cover gasket; 7 - thermostat cover; 8 - radiator; 9 - water pump gasket; 10 - water pump; 11 - manifold outlet fitting; 12 - metal tube; 13 - elastic hose; 14 thermostat housing/head pipe; A - entrance to the metal tube from the lower radiator pipe; B - entrance to the metal tube from the stove; C - output from the thermostat housing; D - output from thermostat to radiator; E - entrance to the metal tube from the drive manifold; F - output from the thermostat housing to the drive manifold

Engine 1.6 and 1.8 carburetor

5. Temperature sensor: located in the outlet fitting from the head, above the flywheel.

6. Thermal switch: located on the upper surface of the coolant pipe tee. This tee is screwed to the engine head on the spark plug side. The switch is used to control the on/off of the mixture heater in the drive manifold.

7. Thermal switch: located in the tee housing screwed to the engine head on the spark plug side. This switch is used to control the throttle on the automatic starting equipment, 1.8 engine with fuel injection.

8. Temperature sensor: located in a tee screwed to the engine head on the spark plug side. The sensor is screwed in from below or above, depending on the type of tee.

9. Thermal switch: located on the upper surface of the tee screwed to the engine head on the spark plug side.

Engine 1.6D (diesel)

10. Temperature sensor: located in the side wall of the tee, screwed to the engine head on the injector side.

11. Heater sensor: located in the fitting screwed to the head above the flywheel. At temperatures above 35°C, it disconnects the voltage from the heaters.

All types of engines

12. Disconnect the electrical wiring from this temperature sensor or thermal switch.

[The original information is posted on the website VWmanual]

13. Unscrew and remove the sensor or switch and seal the hole with a plug prepared in advance.

14. During installation, it is necessary to pay attention that when tightening to a torque of 10 Nm, the key does not come off, which could damage the switch or sensor. Check and, if necessary, add fluid to the cooling system.