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Draining and filling coolant > < Coolant hose schematic diagram

Checking for leaks in the engine cooling system

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-
  W00-10657
t  Adapter for cooling system tester -V.A.G 1274/8-
  W00-0703
t  Adapter for cooling system tester -V.A.G 1274/9-
  W00-0564
t  Adapter for cooling system tester -V.A.G 1274/10-
Test prerequisite
l  Engine at operating temperature.
Test sequence:
  WARNING
Hot steam may escape when expansion tank is opened. Place cloth over cap and open with caution.
–  Open filler cap on coolant expansion tank.
  W00-0690
–  Screw adapter for cooling system tester -V.A.G 1274/8- into coolant expansion tank -1-.
–  Screw adapter for cooling system tester -V.A.G 1274/10- into adapter for cooling system tester -V.A.G 1274/8-.
–  Clamp connector -V.A.G 1274 B/1- into adapter for cooling system tester -V.A.G 1274/10-.
–  Join connection piece -V.A.G 1274 B/1- to cooling system tester -V.A.G 1274 B- using connecting hose supplied.
–  Using hand pump on tester, build up a pressure of approx. 1.5 bar.
  DANGER!
Risk of scalding! Before disconnecting cooling system tester -V.A.G 1274 B- from the connecting hose or connecting piece -V.A.G 1274 B/1-, it is essential that the pressure is 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 pressure drops:
–  Search for leaks within engine compartment and on underside of vehicle.
Check pressure relief valve in cap.
  N19-10775
–  Screw cap -1- into adapter for cooling system tester -V.A.G 1274/9--2-.
–  Clamp connector -V.A.G 1274 B/1- into adapter for cooling system tester -V.A.G 1274/9-.
–  Join connection piece -V.A.G 1274 B/1- to cooling system tester -V.A.G 1274 B- using connecting hose supplied.
–  Build up a pressure of approx. 1.6 bar using hand pump on cooling system tester.
The pressure relief valve must not open.
If the pressure relief valve opens prematurely:
–  Renew cap.
–  Increase pressure further.
The pressure relief valve must open once the opening pressure is exceeded.
If the pressure relief valve does not open:
–  Renew cap.
  N19-10776

Draining and filling coolant > < Coolant hose schematic diagram