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Components of the cooling system > < Removing and installing radiator outlet coolant temperature senderG83

Leon Mk1

Check the cooling system for leaks
Check the cooling system for leaks
Consult the equivalence table for tools and equipment according to applicability among Seat / VW / Audi / Skoda → Chapter.
   
Special tools and workshop equipment required
t  Coolant tester -VAG 1274B-, see equivalent → Anchor
t  Adapter -VAG 1274/8-, see equivalent → Anchor
t  Adapter -VAG 1274/9-, see equivalent → Anchor

Test condition
l  Engine must be warm.
Checking process:
  WARNING
Steam may be released when opening the expansion tank. Cover the cap with a cloth and open carefully.
–  Open cap on coolant expansion tank.
–  Mount the cooling system tester -VAG 1274B- with adapter -V.A.G 1274/8- onto the expansion tank.
–  Clamp connector -V.A.G 1274 B/1- into adapter for cooling system tester -V.A.G 1274/8-.
–  Connect the connecting piece -V.A.G 1274 B/1- together with the connecting hose of the device to the cooling system tester -V.A.G 1274 B-
–  Use hand pump on tester to create a pressure of about 1.0 bar.
  DANGER!
Risk of scalding! Before disconnecting cooling system tester -V.A.G 1274 B- from connecting hose or connector -V.A.G 1274 B/1-, always relieve existing pressure. To do this, press pressure relief valve on cooling system tester -V.A.G 1274 B- until pressure gauge displays value of »0«.
If the pressure drops:
–  Locate and eliminate the leak in the engine compartment and underfloor. Remove the noise insulation, where necessary.
Check pressure relief valve in cap.
–  Screw cap into adapter for cooling system tester -V.A.G 1274/9-.
–  Clamp connector -V.A.G 1274 B/1- into adapter for cooling system tester -V.A.G 1274/9-.
–  Connect the connecting piece -V.A.G 1274 B/1- together with the connecting hose of the device to the cooling system tester -V.A.G 1274 B-
–  Build up pressure with hand pump on cooling system tester. In the following table, you can obtain the highest values for the respective vehicle / engine combination.
   
CFHCCFJACLCB
1.4 bar1.4 bar1.4 bar

The pressure relief valve must not open.
If the pressure relief valve opens prematurely:
–  Renew sealing cap.
–  Increase pressure referring to the respective vehicle / engine combination table.
The pressure relief valve must open once the opening pressure is exceeded.
If the pressure relief valve does not open:
–  Renew cap.
   

Components of the cooling system > < Removing and installing radiator outlet coolant temperature senderG83