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Removing and installing radiator > < Inspecting coolant system with cooling system testing device V.A.G 1274 for tightness

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Inspecting coolant system with cooling system testing device V.A.G 1274 B for tightness
Inspecting coolant system with cooling system testing device -V.A.G 1274 B- for tightness
Special tools and workshop equipment required
t  Cooling system testing device -V.A.G 1274B-
t  Adapter -V.A.G 1274/8-
t  Adapter -V.A.G 1274/9-
Test condition
l  Engine is at operating temperature.
Test sequence
  WARNING
Hot steam may escape when the compensation bottle is opened. Cover the cap with a cloth and open carefully.
–  Open the cap of the coolant expansion reservoir.
–  Screw the adapter for the cooling system testing device -V.A.G 1274/8- into the coolant expansion bottle.
–  Connect the connecting piece -V.A.G 1274 B/1- to the adapter for the cooling system testing device -V.A.G 1274/8-.
   
–  Connect the connecting piece -V.A.G 1274 B/1- via the delivered connecting hose to the cooling system testing device -V.A.G 1274 B-.
–  Using the hand pump of the testing device generate an overpressure of approx. 0.1 MPa (1.0 bar).
  WARNING
Risk of scalding!
t  Before the cooling system testing device -V.A.G 1274 B- is separated from the connecting hose or the connecting piece -V.A.G 1274 B/1-, the existing pressure must absolutely be released.
t  For this step, press the pressure relief valve on the cooling system testing device -V.A.G 1274 B- until the pressure gauge indicates the value »0«.
If the pressure drops:
–  Search position of the leak and repair fault.
Testing the pressure relief valve in the cap
–  Screw the screw cap into the adapter for the cooling system testing device -V.A.G 1274/9-.
–  Connect the connecting piece -V.A.G 1274 B/1- to the adapter for the cooling system testing device -V.A.G 1274/9-.
  A19-10645
–  Connect the connecting piece -V.A.G 1274 B/1- via the delivered connecting hose to the cooling system testing device -V.A.G 1274 B-.
–  Operate the handpump.
l  The pressure relief valve should open at a pressure of 0.14 ... 0.16 MPa (1.4 ... 1.6 bar).
If the pressure relief valve opens too early or too late:
–  Replace cap.
  A19-10748

Removing and installing radiator > < Inspecting coolant system with cooling system testing device V.A.G 1274 for tightness