The first step to changing the A/C discharge hose/line is to unhook the negative battery cable, disconnect the refrigerant charging lines and let the refrigerant out of the system. For 4.0L model vehicles, take out the bolt holding the refrigerant line support bracket to the engine and remove the discharge line from the bracket. After that, take out the bolt holding the discharge line fitting to the compressor, unhook the fitting from the compressor discharge port and throw away the seal. Seal the opening to the condenser-side fitting and use tape to cover the compressor discharge port, then unscrew the nut on the discharge line fitting to disconnect it from inside the condenser and remove it from the car. Take out the O-ring seal from the discharge line fitting and seal up or tape the opened fitting and the condenser inlet port. First, put the discharge line in the engine section. Then, remove the covering or plugs from the condenser inlet socket and fitting for the discharge line and apply a drop of clean refrigerant oil to a new O-ring. Fit the O-ring and then plug it into the discharge line fitting, next matching it to the condenser inlet port. Install the fitting nut, fasten it so it reaches 12 Nm (105 in. lbs.), then peel off the tape or plugs covering the ports or fittings, apply new O-ring seal and install the seal on the discharge line fitting. Tighten the fitting bolt to 25.4 Nm (20 ft. lbs.) and mount the discharge line into the refrigerant bracket, securing it by tightening the bracket bolt to 28 Nm (21 ft. lbs.). Once everything is done, remove the vehicle, drain the refrigerant and put everything back in after recharging the system.