Replacing the coolant and bleeding the cooling system

1. Drain cooling system (only with engine cooled off). Set heater lever to "hot", open drain plug at radiator and loosen coolant hose at auxiliary plastic flange of coolant pump.

2. Screw drain plug into radiator. Tightening torque: 5 Nm (4 ftlb). Fit coolant hose to flange

3. Leave heater lever in "hot" position or set to the hot position now and screw out bleeder screw. Fill up with coolant slowly until coolant overflows at the bleeder flange.

Bleederflange

4. Turn bleeder screw a few turns in. Start engine and run at accelerated idle to warm it up to operating temperature (until radiator fan has switched on and off).

As soon as no more air bubbles escape at the bleeder bore, tighten bleeder screw. Tightening torque 15 + 3 Nm (11 +2 ftlb). Top up coolant level to "max:" mark on reservoir.

Porsche 968 Cooling System

Check coolant level again after a test drive. If required, top up with coolant.

Drain some coolant until the coolant level has settled halfway down in the reservoir (this is required to keep the reservoir from overflowing when the engine warms up).

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