Cleaning the cooling system

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CAUTION: Danger of scalding! Coolant can be very hot.

CAUTION: Wear suitable protective equipment.

Repair the damaged component. Repair or replace the component which is causing the oil/coolant mixture.
Open hood.
Open tank cap on the expansion tank and remove.

Fig 1: Removing Coolant Expansion Tank Cap
Courtesy of PORSCHE OF NORTH AMERICA, INC.
Remove the entire underbody cover.

Fig 2: Removing Entire Underbody Cover
Courtesy of PORSCHE OF NORTH AMERICA, INC.
Drain cooling system. Remove the drain plug from the engine, drain the coolant into a container and dispose of coolant according to the country-specific legal requirements.

Fig 3: Removing Coolant Drain Plug
Courtesy of PORSCHE OF NORTH AMERICA, INC.
Pull the radiator supply and return lines off the engine. To do so, undo the hose clamps, carefully pull off the hoses and allow the remaining coolant to run out. Then connect the hoses again and tighten the hose clamps.

Fig 4: Pulling Radiator Supply And Return Lines Off Engine
Courtesy of PORSCHE OF NORTH AMERICA, INC.
Tighten the drain plug on the engine. Tightening torque: 10 to 15 Nm (7.5 to 11 ftlb.).

Fig 5: Tightening Coolant Drain Plug On Engine
Courtesy of PORSCHE OF NORTH AMERICA, INC.

Start vehicle.
After the vehicle has been bled and the coolant temperature is > 80°C, let the stationary vehicle run at medium speed for at least 15 minutes.
Switch off engine.
CAUTION:
Danger of scalding
- Allow the coolant to cool down before opening the coolant circuit.
- Coolant can be very hot.
- Wear suitable protective equipment.
Slowly and carefully open the coolant expansion tank.

Fig 1: Opening Coolant Expansion Tank
Courtesy of PORSCHE OF NORTH AMERICA, INC.
Unscrew the coolant drain plug on the engine and drain and collect the radiator cleaning agent. Disposal should be carried out according to the country-specific legal requirements.

Fig 2: Identifying Coolant Drain Plug
Courtesy of PORSCHE OF NORTH AMERICA, INC.
Pull the radiator supply and return lines off the engine. To do so, undo the hose clamps, carefully pull off the hoses and allow the remaining liquid to run out.

Fig 3: Pulling Radiator Supply And Return Lines Off Engine
Courtesy of PORSCHE OF NORTH AMERICA, INC.
Rinse away any adhering oil in the coolant expansion tank with hot water.
Connect the hoses again and tighten the hose clamps.
Tighten drain plug on the engine with a tightening torque of 10 Nm (7.5 ftlb.) to 15 Nm (11.0 ftlb.).

Fig 4: Tightening Coolant Drain Plug
Courtesy of PORSCHE OF NORTH AMERICA, INC.
NOTE:
- Points 1 to 9 must be repeated until no more oil rises to the surface in the coolant expansion tank.
Fill the coolant circuit with water only and then bleed the cooling system according to the regulations.
Start engine.
After the vehicle has been bled and the coolant temperature is > 80°C, let the stationary vehicle run at medium speed for at least 15 minutes.
Switch off engine.
CAUTION:
Danger of scalding
- Allow the coolant to cool down before opening the coolant circuit.
- Coolant can be very hot.
- Wear suitable protective equipment.
Carefully open the coolant expansion tank and reduce the existing residual pressure.
Unscrew the coolant drain plug on the engine and drain the radiator cleaning agent.

Fig 5: Removing Coolant Drain Plug
Courtesy of PORSCHE OF NORTH AMERICA, INC.
Pull the radiator supply and return lines off the engine. To do so, undo the screw-type hose clamps, carefully pull off the hoses and allow the remaining water to run out.

Fig 6: Pulling Radiator Supply And Return Lines Off Engine
Courtesy of PORSCHE OF NORTH AMERICA, INC.
NOTE:
- All hoses which have been removed during work on the cooling system must be replaced.
- The Y-piece in the cooling system must be replaced.
Remove and replace hoses which have been pulled off fittings.
Replace the Y-piece on the vehicle underbody.

Fig 7: Replacing Y-Piece On Vehicle Underbody
Courtesy of PORSCHE OF NORTH AMERICA, INC.
To do so, open the three fastening clamps with commercially available spring-band clamp pliers and pull off the Y-piece. Clean the flange with a cloth soaked in solvent naphtha and fit the new Y-piece.

Fig 8: Opening Three Fastening Clamps On Y-Piece
Courtesy of PORSCHE OF NORTH AMERICA, INC.
Clean the flanges of the coolant circuit. Use a cloth soaked in solvent naphtha and clean the flanges from which the coolant hoses have been disconnected.
NOTE:
- The coolant hoses may only be coated with water as a lubricant to make the fitting of the hoses easier.
- Never treat coolant hoses with spray oil.
Connect the new coolant hoses again and tighten the screw-type hose clamps or the spring-band clamps.
Fit coolant drain plug with new sealing ring. Tightening torque 10 Nm (7.5 ftlb.) to 15 Nm (11.0 ftlb.).

Fig 9: Fitting Coolant Drain Plug
Courtesy of PORSCHE OF NORTH AMERICA, INC.
Fill the cooling system with a mixture of anti-freeze protection and water (mix ratio 50:50) and bleed.
Check the cooling system for leaks.

Fig 10: Checking Cooling System For Leaks
Courtesy of PORSCHE OF NORTH AMERICA, INC.
Fit the underside panel into place again.

Fig 11: Fitting Underside Panel
Courtesy of PORSCHE OF NORTH AMERICA, INC.
Perform an extended test drive with the vehicle and subsequently check the coolant level.