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Installing and removing the heating/air-conditioning unit: Installation

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  1. Ensure that the air distributor casing and air guides are correctly positioned. Engage the electrical plug connections and carefully lay the electrical cables (do not pinch).
  2. Observe the safety regulations for handling airbag units (see SAFETY REGULATIONS FOR VEHICLES WITH AIRBAG AND BELT TENSIONER ).
  3. Set the steering column switch: Use a depth gauge to measure between the end of the steering axle and the metal cover of the steering column switch (see figure). Adjustment dimension: 55 +/- 0.5 mm
    Fig 1: Adjusting Steering Column Switch
    G03150946Courtesy of PORSCHE OF NORTH AMERICA, INC.
  4. Replace the seal between the current distributor and firewall if necessary. After fitting the current distributor on the firewall (tightening torque 15 Nm), tighten the battery cable with a new M8 hexagon nut. Tightening torque: 15 Nm.
  5. Replace the O-rings for the refrigerant lines at the expansion valve and wet the new O-rings with refrigerant oil.
    NOTE:
    • If the heating/air-conditioning unit is replaced, the refrigerant oil in the evaporator must be topped up. Determine the quantity of the refrigerant oil and top up again with refrigerant oil (volume removed by suction + 20 cm3 ). Refrigerant oil removed by suction from a previously run air-conditioning system may no longer be used (special-category waste).
  6. The heat exchanger is connected to the engine-cooling system, and coolant flows through it when the engine is running. The cooling system must be bled after removal or installation of the heater/air-conditioning unit (see DRAINING AND FILLING IN COOLANT (INCLUDES: BLEEDING ).