Removing Oil-Water Heat EXCHANGER

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Remove cap on coolant expansion tank.
Undo drain plug on the coolant guide housing and drain the coolant.

Fig 1: Removing Coolant Drain Plug
Courtesy of PORSCHE OF NORTH AMERICA, INC.
Equip drain plug with a new sealing ring and fit in the coolant guide housing. Tightening torque: 10+5 Nm (7.5+3.5 ft.lb)
Raise convertible top compartment lid.
Remove engine-compartment cover.
Remove throttle body with intake distributor intermediate piece.
Remove oil-water heat exchanger.

Fig 2: Removing Oil-Water Heat Exchanger
Courtesy of PORSCHE OF NORTH AMERICA, INC.