Volkswagen Passat 1995 Official Factory Repair Manual page 4083

Heating and ventilation system
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Fig. 9 Heating and ventilation unit installing
Note:
Close evaporator connections to ensure that no
coolant enters passenger compartment when
removing.
Installing:
- Pre-assemble hex nuts on engine bulkhead.
- Tighten hex nut with shank, in plenum chamber.
- Tighten engine bulkhead Hex nuts.
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