audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

ABOUT US
Exhaust turbocharger, G-charger > < Checking radiator fan V7

A4 Mk1

Checking cooling system for leaks
Checking cooling system for leaks
Special tools and workshop equipment required
   
t  Cooling system tester -V.A.G 1274- with -V.A.G 1274/8-
  W00-0528
Procedure
l  Engine must be warm.
  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.
–  Attach cooling system tester -V.A.G 1274- with adapter -V.A.G 1274/8- to expansion tank.
–  Use hand pump on cooling system tester to create a pressure of approx. 1.0 bar.
If the pressure drops:
–  Trace leak and repair.
  A19-0079
Checking pressure relief valve in filler cap
–  Attach cooling system tester -V.A.G 1274- with adapter -V.A.G 1274/9- to filler cap.
–  Use hand pump on cooling system tester to create pressure.
l  The pressure relief valve should open at a pressure of 1.2 ... 1.5 bar.
If the pressure relief valve does not open as described:
–  Renew filler cap.
  A19-0055

Exhaust turbocharger, G-charger > < Checking radiator fan V7