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Coolant radiator, thermostat, 4/2 way valve with thermostat: Assembly overview > < Draining off and filling coolant

Leon Mk2

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 -V.A.G 1274/9-, see equivalent → Anchor

Test condition
l  Engine must be warm.
Checking sequence
  WARNING
Hot steam/hot coolant can escape - risk of scalding.
The cooling system is under pressure when the engine is hot.
Cover filler cap on expansion tank with a cloth and open carefully to dissipate pressure.
–  Open filler cap on coolant expansion tank.
   
–  Insert pressure tester -VAG 1274B- with adapter -V.A.G 1274/8- into expansion reservoir.
–  Using hand pump on tester, build up a pressure of approx. 1.0 bar.
–  If this pressure is not maintained, locate and rectify leaks.
  A19-10646
Check pressure relief valve in cap.
–  Insert pressure tester -VAG 1274B- with adapter -V.A.G 1274/9- into cover.
–  Operate hand pump.
t  The pressure relief valve should open at a pressure of 1.4 ... 1.6 bar.
If the pressure relief valve does not open:
–  Renew sealing cap.
  A19-10748

Coolant radiator, thermostat, 4/2 way valve with thermostat: Assembly overview > < Draining off and filling coolant