Replacing the coolant (Opel Vectra A)

The coolant should only be changed if the system has been drained as a result of repairs. The coolant is not changed during routine annual maintenance. If the cylinder head, radiator, heater radiator or engine itself is replaced during repairs, the coolant is naturally changed. This must be done because the anti-corrosion additives in the coolant are deposited on the light alloy engine parts during operation, thus creating reliable anti-corrosion protection. The content of anti-corrosion elements in used coolant is insufficient to provide reliable engine protection.

Warning! Coolant is poisonous. It must not be poured out or mixed with household waste.

Drain

Set the interior heater controls to maximum heat.

Open the expansion tank cap.

Caution! If the engine is hot, place a thick cloth on the cap before removing it to prevent burns from hot coolant or its vapors. The cap should only be removed when the coolant temperature is below 90°C.

Loosen the clamp securing the lower radiator hose. Remove the hose and drain the coolant completely.

Filling

Caution: Since the radiator and heater core are made of aluminum, only DOT-4 rated coolant should be used.

Connect the lower hose to the radiator and secure it with a clamp.

1.4 and 1.6 liter engines

Disconnect the connector from the coolant temperature sensor and unscrew the sensor.



Fill the expansion tank with coolant until it appears from the sensor hole.

Screw in the sensor and tighten it to 10 Nm. Connect the connector.

Fill the expansion tank with coolant up to the "KALT" mark.

Screw the expansion tank screw cap in until it stops.

Start the engine and increase the speed to approximately 3000 rpm (until the thermostat opens). The lower radiator hose becomes warm.

Check the cooling system for leaks.

Turn off the engine and wait until it cools down.

Check the coolant level and top up if necessary.