Engine at operating temperature (oil temperature ≥ 80 ° C). Check coolant level, correct if necessary - see operation "Cooling System, Top Up and Bleed".
Install, Connect
Bolt Adapter KM-471 (1) and Coolant Tester (2) to coolant compensation tank (observe manufacturer's instructions).
Apply approx. 100 kPa (1 bar/14.5 psi) to cooling system.
Notice:
Radiator tester is available via the "Opel/Vauxhall Workshop Equipment" catalogue.
Inspect
Cooling System, Check for Leaks
Install, Connect
Disconnect checking equipment and Adapter KM-471 from coolant compensation tank and seal coolant compensation tank.
Install, Connect 
Inspect 