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Fuel supply, gas operation > < Cooling system components: Removing and installing.

Leon Mk1

Cooling system: checking the seal
Cooling system: checking the seal
t  Test sequence → Anchor
t  Testing pressure relief valve in filler cap → Anchor
   
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 -SAT 1274-, see equivalent → Anchor
t  Adapter -VAG 1274/8-, see equivalent → Anchor
t  Adapter -VAG 1274/9-, see equivalent → Anchor

Test prerequisites
l  Engine at operating temperature
Test sequence
  WARNING
Hot vapour/hot coolant may escape when opening expansion tank. Cover cap with cloth and open carefully.
–  Open the cap of the coolant expansion tank.
–  Fit the cooling tester -SAT 1274- with the adapter -VAG 1274/8- onto the expansion tank.
–  Use the hand pump on the tester to create an overpressure of approx. 1.0 bar.
If the pressure drops:
–  Find the leaks and repair them.
Checking pressure relief valve in filler cap
–  Fit the cooling tester -SAT 1274- with the adapter -VAG 1274/9- onto the filler cap.
–  Operate hand vacuum pump.
l  At a pressure of 1.4 ... 1.6 bar, the pressure release valve should open.
–  If the valve does not open:
l  Replace the sealing plug.
   

Fuel supply, gas operation > < Cooling system components: Removing and installing.