VW CGRA - Page 169

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♦ Adapter for cooling system tester - V.A.G 1274/9-
Procedure:
• Engine at operating temperature.
WARNING
The cooling system is under pressure when the engine is hot!
Danger of scalding by steam and hot coolant.
Cover filler cap on expansion tank with a cloth and open care‐
fully to release pressure.
– Open filler cap on expansion tank.
– Fit cooling system tester - V.A.G 1274 B- with adapter -
V.A.G 1274/8- to coolant expansion tank.
– Build up pressure of approx. 1.0 bar using hand pump of cool‐
ing system tester.
– If this pressure is not maintained, locate and rectify leaks.
Check pressure relief valve in cap.
– Fit cooling system tester - V.A.G 1274 B- with adapter -
V.A.G 1274/9- onto coolant filler cap.
– Build up pressure using hand pump of cooling system tester.
• The pressure relief valve must open at a pressure of 1.4 to
1.6 bar.
– Renew filler cap, if pressure relief valve does not open as de‐
scribed.
Touareg 2010 ➤ , Touareg 2015 ➤
6-cylinder direct-injection engine (3.6 l engine, 4V) - Edition 12.2019
4. Coolant 163