Coolant: Service and Repair
WM 193817 Draining and filling in coolant (includes bleeding the system)
Tools
Technical values
Preliminary work
1. Remove rear underbody panelling.
=> 519419 Removing and installing cover for rear underbody.
Draining
Draining coolant
WARNING
Hot fluid
- Danger of scalding
-> Let the fluid cool down.
-> Wear personal protective gear.
WARNING
Caustic fluids
- Danger of chemical burns
-> Avoid contact with caustic fluid.
-> Wear personal protective gear.
-> Ensure that there is good ventilation.
-> If you do come into contact, wash off immediately with plenty of warm water and contact a doctor if necessary.
1. Open the cap -1- on the expansion tank and remove it.
Cap on coolant expansion tank
2. Unscrew coolant drain plugs (hexagon socket).
2.1. Unscrew the drain plug (hexagon socket) on the coolant guide tube -1-.
Coolant drain plug on coolant guide
2.2. Unscrew the drain plug on the thermostat housing -1-.
Coolant drain plug on thermostat housing
3. Collect emerging coolant.
3.1. To do this, secure a pan -2- on a transmission jack and position it under the drain positions.
Coolant pan on transmission jack
4. After draining the coolant, screw in and tighten drain plugs with new sealing rings.
=> Tightening torque: 25 Nm (19 ftlb.)
Coolant hoses at the underbody - draining additional coolant
1. Loosen large coolant hoses -1-.
1.1. Pull off safety clips -2- on the Henn couplings.
Coolant supply hose for engine
1.2. Open the spring band clamps -3- on the heater hoses -4-.
Coolant return pipe to radiator and heater lines
Information
- Check O-rings on the plug-in couplings and replace them if necessary.
- Clean plug connection and coolant hoses before assembly.
- Coat O-rings and coolant hoses with Kluber Plus Gel (Part No. 000.043.205.93).
- Remove stoppers before fitting the coolant lines and hoses.
2. Place a pan underneath and pull off the hose connections.
2.1. Refit the coolant hoses after draining the coolant. Check the safety clips.
Filling in
Filling coolant (includes bleeding)
CAUTION
Mixing coolant.
- Corrosion of components and flocculation of coolant.
-> Do not mix Porsche coolant with other coolants.
-> When replacing or topping up coolant, use only original Porsche coolant (see Porsche Parts Catalogue).
Information
The process of filling and bleeding the cooling system is performed using the special tool filling device 9696.
Information
- If a vacuum does not build up, there is a leaking valve in the coolant circuit.
- Deformation of the rubber hoses of the cooling system is normal.
- When the pressure gauge pointer is in the green area of the display scale, a sufficient vacuum has been built up.
- After both shutoff valves on the vacuum pressure gauge have been closed and the compressed air supply has been disconnected, the vacuum must not drop. If the vacuum drops within approx. 30 seconds, there is a leak in the coolant circuit.
1. Screw cap adapter for coolant expansion tank (K22) onto the tank and attach the flexible extension (Fz 100) to the cap.
Adapter K22 on coolant expansion tank
2. Connect the vacuum pressure gauge of the bleeder tool to the flexible extension. When doing so, ensure that both shut-off valves are closed (positioned at 90° to flow direction).
3. Connect the Venturi nozzle to the vacuum pressure gauge.
Venturi nozzle on vacuum pressure gauge
Information
- The quantity of coolant available should exceed the amount required to fill the system by about two liters in order to prevent air being sucked in.
- An antifreeze content of -35 °C corresponds to a mixture of 50:50 (antifreeze: water).
4. Place a canister with a sufficient amount of coolant and with an antifreeze content of -35 °C behind the vehicle close to the expansion tank.
Information
- The bleeding process is completed more quickly if the canister is positioned at the same height as the coolant reservoir.
5. Push the filler hose of the vacuum pressure gauge -5- onto the canister connection. Draw off the return line -6- of the Venturi nozzle into a second empty container.
Special canister filling tool
Information
- A hissing sound after connecting the compressed air supply is normal.
6. Connect the compressed air supply to the Venturi nozzle.
Compressed air supply on Venturi nozzle
7. Open both shut-off valves on the vacuum pressure gauge until the transparent filler hose has completely filled with coolant.
Shut-off valves open
8. Close left shut-off valve on the vacuum pressure gauge and allow a vacuum to build up in the coolant circuit.
Left-hand shut-off valve closed
9. When there is enough vacuum in the cooling system (pointer is in the green area), close the right shut-off valve and then unplug the compressed air supply.
Vacuum established (pointer in green area)
10. Open the left shut-off valve on the vacuum pressure gauge (right-hand valve closed -arrow- ). The cooling system is then filled.
Left-hand shut-off valve open - right-hand valve (arrow) closed
11. When the cooling system no longer contains a vacuum (vacuum pressure gauge shows zero), i.e. no more coolant is being sucked out of the canister, open the right-hand shut-off valve.
12. Then, remove the filling device.
13. If necessary, fill the coolant expansion tank with coolant up to the maximum marking and screw on the cap -1- of the expansion tank (do not tilt).
Cap on coolant expansion tank
Subsequent work
1. Check coolant line connections and hoses for leaks.
2. Completely install rear underbody panelling.
=> 519419 Removing and installing cover for rear underbody.
3. Test drive the vehicle. Following the test drive and when the engine is still at operating temperature, accelerate briefly to 6,000 rpm a number of times at idle speed in order to fully ventilate the system.
4. Check the fluid level with the aid of the markings on the expansion tank. Correct the coolant level after the engine has cooled if necessary.