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Home >> Porsche >> 2003 >> 911 Carrera 4S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 38 (Engine) >> Engine, Cooling >> Cooling System Cleaned (Oil/Coolant Mixture) >> Cleaning Cooling System

Cleaning Cooling System

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  1. Start vehicle.
  2. 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.
  3. 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.
  4. Slowly and carefully open the coolant expansion tank.
    Fig 1: Opening Coolant Expansion Tank
    G03092703Courtesy of PORSCHE OF NORTH AMERICA, INC.
  5. 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: Removing Coolant Drain Plug In Engine
    G03092704Courtesy of PORSCHE OF NORTH AMERICA, INC.
  6. 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: Removing Hose Clamps
    G03092705Courtesy of PORSCHE OF NORTH AMERICA, INC.
  7. Rinse away any adhering oil in the coolant expansion tank with hot water.
  8. Connect the hoses again and tighten the hose clamps.
  9. Tighten drain plug on the engine with a tightening torque of 10 Nm (7.5 ft.lb) to 15 Nm (11.0 ft.lb).
    Fig 4: Tightening Coolant Drain Plug In Engine
    G03092706Courtesy of PORSCHE OF NORTH AMERICA, INC.
  10. Fill the coolant circuit with water only and then bleed the cooling system according to the regulations.
  11. Start engine.
  12. 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.
  13. 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.
  14. Carefully open the coolant expansion tank and reduce the existing residual pressure.
  15. Unscrew the coolant drain plug on the engine and drain the radiator cleaning agent.
    Fig 5: Removing Coolant Drain Plug In Engine
    G03092707Courtesy of PORSCHE OF NORTH AMERICA, INC.
  16. 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: Removing Screw-Type Hose Clamps
    G03092708Courtesy 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.
  17. Remove and replace all hoses that need to be replaced or have been disconnected from the flange.
  18. Replace the Y-piece on the vehicle underbody.
    Fig 7: Locating Y-Piece On Vehicle Underbody
    G03092709Courtesy of PORSCHE OF NORTH AMERICA, INC.
  19. 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: Pulling Off Y-Piece
    G03092710Courtesy of PORSCHE OF NORTH AMERICA, INC.
  20. 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.
  21. Connect the new coolant hoses again and tighten the screw-type hose clamps or the spring-band clamps.
  22. Fit coolant drain plug with new sealing ring. Tightening torque 10 Nm (7.5 ft.lb) to 15 Nm (11.0 ft.lb).
    Fig 9: Fitting Coolant Drain Plug On Engine
    G03092711Courtesy of PORSCHE OF NORTH AMERICA, INC.
  23. Fill the cooling system with a mixture of anti-freeze protection and water (mix ratio 50:50) and bleed.
  24. Check the cooling system for leaks.
    Fig 10: Checking Cooling System For Leaks
    G03092712Courtesy of PORSCHE OF NORTH AMERICA, INC.
  25. Fit the underside panel into place again.
    Fig 11: Fitting Underside Panel Into Place
    G03092713Courtesy of PORSCHE OF NORTH AMERICA, INC.
  26. Perform an extended test drive with the vehicle and subsequently check the coolant level.
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