Porshe 911 (997). Manual - part 100

→ Wear protective gloves and goggles.

WARNING

Coolant is corrosive and hazardous to health.

Skin and eye irritation

• 

→ Wear protective gloves and goggles.

→ If you come into contact with coolant, wash off immediately with plenty of warm water.

3. Drain any remaining coolant by removing inlet hose to water pump -1- . Collect coolant in a clean

container. Attach inlet hose again.

Henn coupling for coolant hose inlet

4. Remove inlet and outlet hoses from radiators Do this by pulling off the spring clips for the two Henn

couplings -1- and pulling the hoses away from the coolant pipes -2- . Collect coolant in a clean container.
Now reattach the clips in the right position in the couplings and insert the hoses The connection should
audibly snap into place. Check correct positioning once again by pulling on the hoses.

Unclipping heating hoses

5. Remove heating hoses on underside of car. Secure the pipes with hose clips and then open the spring

clips Remove both hoses and slowly open hose clips. Allow coolant to drain into a clean container.
Clean hoses, stick them back and attach the clips. Check that the hoses are firmly in place.

Diagnostic system: reading out fault memory and activating systems

Draining coolant

557

Filling with coolant

Filling coolant (includes bleeding)

Note

The process of filling and bleeding the cooling system continues to be performed using the special tool
Radiator filling device 9696

.

Note

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.

• 

Adapter K22 on coolant expansion tank

1. Screw cap adapter for coolant expansion tank (K22) onto the tank and attach flexible extension (Fz 100)

to the cap.

2. Connect vacuum pressure gauge of bleeder tool to the flexible extension. When doing so, ensure that both

shutoff valves are closed (positioned at 90° to flow direction).

Diagnostic system: reading out fault memory and activating systems

 Filling with coolant

558

Venturi nozzle on vacuum pressure gauge

3. Connect the Venturi nozzle to the vacuum pressure

gauge.

Note

The quantity of coolant available should exceed the amount required to fill the system by about two
litres 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 for -35 °C behind the

vehicle near to the expansion tank

Special canister filling tool

Note

The bleeding process is completed more quickly if the canister is positioned at roughly the same
height as the coolant expansion tank.

• 

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 container.

Diagnostic system: reading out fault memory and activating systems

Filling coolant (includes bleeding)

559

Compressed air supply on Venturi nozzle

Note

A hissing sound after connecting the compressed air supply is usual.

• 

6. Connect compressed air supply to Venturi nozzle

Shutoff valves open

7. Open both shutoff valves on the vacuum pressure gauge until the transparent filler hose has completely

filled with coolant.

Left-hand shutoff valve closed

8. Close left shutoff valve on the vacuum pressure gauge and allow a vacuum to build up in the coolant

circuit.

Diagnostic system: reading out fault memory and activating systems

Filling coolant (includes bleeding)

560