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Removing and installing cowling with radiator fanV7 > < Draining and filling coolant

Polo Mk5

Checking cooling system for leaks
   
Checking cooling system for leaks
Special tools and workshop equipment required
t  Cooling system tester -V.A.G 1274 B-
t  Adapter for cooling system tester -V.A.G 1274/8-
t  Adapter for cooling system tester -V.A.G 1274/9-

Test procedure
l  Engine at operating temperature.
  WARNING
When the engine is warm, the cooling system is under pressure.
Hot steam/hot coolant can escape - risk of scalding.
Cover filler cap on expansion tank with a cloth and open carefully to dissipate pressure.
–  Open filler cap on expansion tank.
   
–  Fit cooling system tester -V.A.G 1274 B- with adapter for cooling system tester -V.A.G 1274/8- to expansion tank.
–  Build up pressure of approx. 1.0 bar using hand pump of cooling system tester.
  WARNING
Risk of scalding! Before the cooling system tester -V.A.G 1274 B- is disconnected from the connecting hose or the connector -V.A.G 1274 B/1- it is essential that the pressure is first relieved. To do this, press pressure relief valve on cooling system tester -V.A.G 1274 B- until pressure gauge displays value of »0«.
–  If this pressure is not maintained, locate and rectify leaks.
  A19-10645
Checking pressure relief valve in filler cap
–  Fit cooling system tester -V.A.G 1274 B- with adapter for cooling system tester -V.A.G 1274/8- to filler cap.
–  Build up pressure of approx. 1.6 bar using hand pump of cooling system tester.
The pressure relief valve must not open.
If the pressure relief valve opens prematurely:
–  Renew cap.
–  Increase pressure to over 1.6 bar.
The pressure relief valve must open.
If the pressure relief valve does not open:
–  Renew cap.
  A19-10748

Removing and installing cowling with radiator fanV7 > < Draining and filling coolant