Cars 638.0/1/2 since 13.10.1997.
Removal
1. Disconnect the negative cable from the battery.
2. Remove the heater.
3. Remove control unit 1 (see figure 10.5).
Figure 10.5. Temperature and overheating sensors (cars 638.0/1/2 since 13.10.1997.):
1. Control unit,
2, 3, 5. Lids,
4. Fan,
6. Casing,
7. Retainer,
8. Temperature sensor,
9. Overheating sensor,
10. Wiring connector.
4. Remove cover 2.
5. Remove cover 3 from fan 4.
6. Remove cover 5 from casing 6.
7. Remove the retainer 7.
8. Remove temperature sensor 8 and overheating sensor 9 from casing 6.
9. Disconnect the sensor wiring at wiring connector 10.
Installation
10. Installation is carried out in the reverse order of removal.