Note.
- Necessary special devices, control and measuring instruments, as well as auxiliary means:
- Device for testing the cooling system "VAG 1274 B".
- Adapter (s) of the device for checking the cooling system "V.A.G 1274/8".
- Adapter (s) of the device for checking the cooling system "V.A.G 1274/9".
Note: Warm up the engine to normal operating temperature before starting the test.
Caution: When opening the expansion tank, hot steam may leak out. To avoid eye injury and burns, use safety glasses and protective clothing. After closing the plug with a rag, carefully open it.
1. Open the expansion tank cap.
2. Screw in the adapter for the cooling system testing device "V.A.G 1274/8" in the expansion tank for coolant.
3. Connect the connecting element "VAG 1274 B/1" to the adapter of the device for testing the cooling system "V.A.G 1274/8".
4. Connect the connecting element "VAG 1274 B/1" with the supplied connecting hose to the cooling system testing device "VAG 1274 B".
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5. Using the hand pump on the testing device, create an excess pressure of 0.1 MPa (1.0 bar).
Attention.
- Risk of burns
- Before disconnecting the cooling system tester "VAG 1274 B" from the connecting hose or the connecting element "VAG 1274 B/1", it is absolutely necessary to reduce the pressure.
- To do this, press the relief valve on the cooling system testing device "VAG 1274 B" and hold it pressed until the pressure gauge shows the value "0".
If the pressure value drops
6. Find the leaky area and fix the problem.
Checking the safety valve in the cover
1. Screw the cap into the adapter for the cooling system tester "V.A.G 1274/9", as shown in the figure below.
2. Connect the connecting element "VAG 1274 B/1" to the adapter of the device for testing the cooling system "V.A.G 1274/9", as shown in the figure below.
3. Connect the connecting element "VAG 1274 B/1" with the supplied connecting hose to the cooling system testing device "VAG 1274 B".
4. Pump with a hand pump If there is excess pressure of 0.14...0.16 MPa (1.4...1.6 bar) the safety valve should open.
The safety valve opens too early or too late
5. Replace the plug.
