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

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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).
Comply with safety regulations when handling airbag units (see SAFETY REGULATIONS FOR VEHICLES WITH AIRBAG AND BELT TENSIONER ).
Set the steering column switch: Measure with a depth gauge between end of steering shaft and steering-column switch cover plate (see Fig 1 ). Adjustment dimension 55 +/- 0.5 mm

Fig 1: Setting Steering Column Switch
Courtesy of PORSCHE OF NORTH AMERICA, INC.
Replace gasket between current distributor and firewall if necessary. After the current distributor is mounted on the firewall (tightening torque 15 Nm (11 ftlb.)) the battery cable is tightened with a new hexagon nut M8. Tightening torque: 15 Nm (11 ftlb.)
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 fill up again with refrigerant oil (volume removed by suction + 20 cm³ ). Refrigerant oil removed from a previously run air-conditioning system may no longer be used (special-category waste).
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) ).