Coolant replacement – Golf 4 and Bora:
1. By slowly unscrewing the cover of the expansion tank, reduce the pressure in the cooling system. Be careful with a hot engine, there is a risk of scalding by the coolant.
2. Remove the noise canceling cover under the motor and prepare a suitable vessel. Under no circumstances may the coolant be drained onto the ground.
3. Unscrew the coolant drain valve at the bottom of the radiator (gasoline engines 1,4 i 1,6 l). In gasoline engines 1,8 l and in diesel engines 1,9 TDI, to drain the liquid, additionally disconnect the oil cooler hose.
4. So that the liquid drains better, remove the cover of the expansion tank. Drain the liquid into the vessel.
5. Tighten the drain valve before refilling the system.
6. Pour coolant slowly into the expansion tank, until no more air bubbles come to the surface.
7. Screw in the cover of the expansion tank.
8. Start the engine and let it idle for approximately two minutes. Then increase the speed to approx. 1500 rpm and top up with coolant to the overflow hole in the expansion tank.
9. Check the coolant level. The level should be up to the MIN marking when the engine is cold, and if the engine is hot, the MAX markings.