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Exhaust turbocharger, G-charger > < Renewing radiator fan motor

A4 Mk2

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

Test condition
l  Engine must be warm.
Test sequence
  WARNING
Hot steam/hot coolant can escape - risk of scalding.
t  The cooling system is under pressure when the engine is hot.
t  To allow pressure to dissipate, cover filler cap on coolant expansion tank with cloth and open carefully.
–  Open filler cap on coolant expansion tank
   
–  Fit cooling system tester -V.A.G 1274- with adapter for cooling system tester -V.A.G 1274/8- on coolant expansion tank.
–  Using hand pump on tester, build up a pressure of approx. 1.0 bar.
–  If this pressure is not maintained, locate and rectify leaks.
Checking pressure relief valve in cap
  A19-0079
–  Fit cooling system tester -V.A.G 1274- with adapter for cooling system tester -V.A.G 1274/9- on filler cap.
–  Operate hand pump.
t  The pressure relief valve should open at a pressure of 1.4 ... 1.6 bar.
  A19-0055

Exhaust turbocharger, G-charger > < Renewing radiator fan motor