Volkswagen Golf 2004 Workshop Manual page 153

– Attach cooling system tester -V.A.G 1274- with cooling system
tester adapter -V.A.G 1274/8- to expansion tank.
– Use hand pump on tester to create a pressure of about 1.0 bar.
Note
If the pressure test is carried out in a period of e.g. 10 minutes,
the pressure will drop due to cooling of coolant. For this reason
the first 30 seconds of test are important.
If the pressure drops within 30 seconds of test:
– Find leaks and rectify.
Checking pressure relief valve in cap
– Attach cooling system tester -V.A.G 1274- with cooling system
tester adapter -V.A.G 1274/9- to cap.
– Use hand pump on cooling system tester to create a pressure
of max. 1.6 bar.
The pressure relief valve must not open.
If the pressure relief valve opens prematurely:
– Renew sealing cap.
– Increase pressure to over 1.6 bar.
The pressure relief valve must open.
If the pressure relief valve does not open:
– Renew sealing cap.
Golf 2004 ➤ , Golf Plus 2005 ➤ , Passat 2006 ➤ , Touran 2003 ➤
4-cylinder diesel engine (2.0 l engine, 4 valve) - Edition 02.2011
147
1. Parts of cooling system