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Draining and filling coolant > < Checking cooling system for leaks

Golf Mk6

Checking oil cooler for leaks
   
Checking oil cooler for leaks
Special tools and workshop equipment required
t  Refractometer -T10007-
t  Hose clips up to 25 mm Ø -3094-
t  Cooling system tester -V.A.G 1274-
t  Adapter for cooling system tester -V.A.G 1274/8-
t  Hose clip pliers -VAS 6340-
t  Drip tray -VAS 6208-

   
t  Torque wrench -V.A.G 1331-
Not illustrated
t  Expansion tank -1K0 121 407 A- or expansion tank -1J0 121 407 B-
t  Plug -191 211 343-
t  Cap -1J0 121 324-
t  Coolant hose -251 265 056-
Prerequisites:
l  Engine cold
Test procedure
–  Remove noise insulation → General body repairs, exterior; Rep. gr.66.
  W00-0427
–  Clamp off supply and return lines to oil cooler using hose clips to Ø 25 mm -VAS 3094-.
–  Release hose clips -arrows- using hose clip pliers -VAS 6340-.
  Note
Collect escaping coolant with drip tray -V.A.G 1306- or drip tray -VAS 6208-.
–  Pull coolant hoses off oil cooler.
  N19-10161
–  Slide cover-5- onto rear connection of oil cooler -4-.
–  Secure sealing plug-2- to breather connection of expansion tank -1-.
–  Secure coolant hose -3- to oil cooler and expansion tank.
–  Fill expansion tank up to „Max“ marking.
–  Attach cooling system tester -V.A.G 1274- with cooling system tester adapter -V.A.G 1274/8- to expansion tank.
–  Use hand pump on tester to create a pressure of about 1.4 bar.
–  Watch pressure drop on pressure gauge. A pressure drop within 10 minutes is not permitted.
If pressure drops:
–  Renew oil cooler → Chapter.
Installation is carried out in the reverse order. When installing, note the following:
–  Check coolant level, replenish coolant if necessary → Chapter.
  N19-10162

Draining and filling coolant > < Checking cooling system for leaks