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Removing and installing coolant pipes > < Draining and filling cooling system

A3 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 or hot coolant can escape when expansion tank is opened; cover filler cap 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 filler cap
  A19-0036
–  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

Removing and installing coolant pipes > < Draining and filling cooling system