Volkswagen Workshop Service and Repair Manuals > Golf Mk5 > Power unit | 4-cylinder diesel engine (2.0 l engine, 2-valve, SDI) | Engine cooling | Parts of cooling system | Checking cooling system for leaks | Testing pressure relief valve in filler cap

Testing pressure relief valve in filler cap

–	Attach cooling system tester -V.A.G 1274- with cooling system tester adapter -V.A.G 1274/9- to cap.

–	Operate hand pump.

At a pressure of 1.4... 1.6 bar, pressure relief valve must open.

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