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Removing and installing parts of cooling system > < Coolant thermostat: Removing and installing

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Cooling system: checking for leaks
Cooling system: checking for leaks
t  Test sequence → Anchor
t  Testing pressure relief valve in filler cap → Anchor
   
Special tools and workshop equipment required
t  Cooling system tester -SAT 1274-
t  Adapter -VAG 1274/8-
t  Adapter -VAG 1274/9-

Test prerequisites
l  Engine warm.
Test sequence
  WARNING
Hot vapour/hot coolant may escape when opening expansion tank. Cover cap with cloth and open carefully.
–  Open the Sealing plug of the coolant expansion tank.
–  Fit the cooling tester -SAT 1274- with the adapter -V.A.G 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 the sealing plug
–  Fit the cooling tester -SAT 1274- with the adapter -V.A.G 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.
   

Removing and installing parts of cooling system > < Coolant thermostat: Removing and installing