Cars 638.0/1/2 up to 11/15/1997.
Removal
1. Disconnect the negative cable from the battery.
2. Remove the heater with the bracket.
3. Unscrew the bolts 1 (see figure 10.3a).
Figure 10.3a. Additional heater control unit (cars 638.0/1/2 up to 11/15/1997.):
1. Bolts,
2. Protective cover,
3. Support plate,
A72. Control unit,
A72.1. Control unit wiring connector.
4. Remove the protective cover 2.
5. Disconnect the wiring connector A72.1.
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6. Disconnect the support plate 3 with the control unit A72.
Installation
7. Installation is carried out in the reverse order of removal.
Cars 638.0/1/2 since 13.10.1997.
Removal
8. Disconnect the negative cable from the battery.
9. Remove the heater.
10. Unscrew the control unit mounting bolts.
11. Remove the control unit 1 of the heater 2 as far as the electrical wires 3 allow (see figure 10.3 b). Disconnect the wiring connector from the control unit.
Figure 10.3 b. Additional heater control unit (cars 638.0/1/2 since 13.10.1997.):
1, Control unit,
2. Heater,
3. Electrical connector.
12. Remove the heater control unit 1.
Installation
13. Installation is carried out in the reverse order of removal.