Cooling System, Checking For Leaks: Notes
Special tools and workshop equipment required
- Cooling System Tester: VAG1274B
- Cooling System Tester - Adapter: VAG1274/8
- Cooling System Tester - Adapter: VAG1274/9
To perform the correct leak test, the check (self-test) of the : VAG1274B must be performed.
Check (self-test) of : VAG1274B
-- Operate the : VAG1274B multiple times.
-- Create a pressure of 3.0 bar (43.51 psi) on the Cooling System Tester.
-- Observe the pressure on the pressure gauge of the Cooling System Tester for 30 seconds.
If No Pressure is Built or the Pressure Decreases:
The : VAG1274B is leaking and must not be used.
Procedure
- Engine at operating temperature.
The cooling system is under pressure when the engine is warm. There is a risk of scalding due to hot steam and hot coolant.
Scalding the skin and other parts of the body is possible.
- Wear safety gloves.
- Wear protective eyewear.
- Reduce the pressure by covering the coolant expansion tank cap with a cloth and carefully opening it.
-- Remove the coolant expansion tank cap -arrow-.
-- Install the : VAG1274/8 into the coolant expansion tank.
-- Clamp the : VAG1274B/1 in the : VAG1274/8 .
-- Connect the : VAG1274B/1 to the : VAG1274B using the hose provided.
-- Generate approximately 1.5 bar (21.75 psi) pressure with cooling system tester hand pump.
- The pressure must not drop more than 0.2 bar (2.9 psi) within 10 minutes.
-- If the pressure falls more than 0.2 bar (2.9 psi), search for leaks and correct the problem.
The pressure decrease of 0.2 bar (2.9 psi) within 10 minutes is a condition of the cooling of the coolant. The colder the engine the more the pressure decrease. If necessary repeat the test with the engine cold.
Before the : VAG1274B is removed, reduce any existing pressure. To do this, press the pressure release valve on the : VAG1274B until the pressure gauge displays >>0<<.