Radiator cooling fan
thermoswitch
Removal
1 The thermostatically controlled switch for the cooling fan is screwed into the radiator side tank.

2 Drain the cooling system as described in Chapter 1.

3 Disconnect the switch wiring and unscrew the switch from its location.

Refitting
4 Refitting is a reversal of removal, but use a new sealing washer if necessary. Fill the cooling system as described in Chapter 1 on completion.

Coolant temperature sensor Removal
5 The coolant temperature sensor may be located in the left-hand end of the cylinder head, on or beneath the thermostat housing, or below the distributor, according to engine type (see illustration).

7.5 Coolant temperature sensor location on XV, XW and XY series engines

On some engines, two
sensors may be fitted, one for the temperature gauge and another for the engine management system. Testing should be carried out by an auto-electrician or by substitution with a known good unit.

6 Partially drain the cooling system (see Chapter 1) to below the level of the sensor unit.

7 Disconnect the wiring from the sensor and unscrew it from its location.

Refitting
8 Screw in the new unit, using a smear of sealant on the threads or a new sealing washer, as applicable. Reconnect the wiring.

9 Top-up the coolant level (see Chapter 1 and “Weekly checks”).

Coolant level sensor
Removal
10 The coolant level sensor is located in the radiator right-hand side tank on XV, XW and XY series engines and in the expansion tank on all other engines (see illustration).

7.10 Cutaway diagram of the coolant level sensor

1 Body
2 Terminal connections
3 Float
4 Magnet
5 Reed contact
a Off position (float lifts magnet above reed contact) b On position (magnet field switches on reed contact)

The switch is float-operated and actuates a warning lamp in the event of a low coolant level.

11 The sensor is removed by unscrewing it from its location after disconnecting the wiring.

Refitting
12 Refitting is a reversal of removal using a new sealing washer where necessary.