How do you bleed the cooling system of an Opel Astra 1400 after replacing a hose?

To bleed the cooling system of an Opel Astra 1400 after replacing a hose, start by filling the coolant reservoir to the appropriate level. Then, run the engine with the heater set to maximum and the radiator cap off, allowing air bubbles to escape. Once the engine reaches operating temperature and the thermostat opens, add more coolant as necessary to maintain the level. Finally, replace the radiator cap and check for any leaks before taking the vehicle for a test drive.