Checking cooling system for leaks (Passat, Passat CC): VW 1.4 (CAVA, CAVB, CAVC, CAVD, …)

🧭 Before you start

Fits: VW Passat CC (357, 2008–2012), VW Passat B7 saloon (362, 2010–2014), VW Passat B7 Variant (365, 2010–2014)

• Renewed: cap

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• Hot steam may escape when expansion tank is opened. Place cloth over cap and open with caution. — Open filler cap on coolant expansion tank.

🔧 Engine codes this applies to

📐 60 workshop diagrams for CAVA

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. ⚠ Hot steam may escape when expansion tank is opened. Place cloth over cap and open with caution. — Open filler cap on coolant expansion tank.
2. Screw adapter for cooling system testerV.A.G 1274/8 into coolant expansion tank.
3. Screw connectorV.A.G 1274 B/1 into adapter for cooling system testerV.A.G 1274/8.
4. Join connection pieceV.A.G 1274 B/1 to cooling system testerV.A.G 1274 B using connecting hose supplied.
5. Using hand pump on tester, build up a pressure of approx. 1.0 bar.

6. ⚠ Risk of scalding! Before the cooling system testerV.A.G 1274 B is disconnected from the connecting hose or the connectorV.A.G 1274 B/1, it is essential that the pressure is first relieved. To do this, press pressure relief valve on cooling system testerV.A.G 1274 B until pressure gauge displays value of »0«. — Find leaks and rectify.
7. Screw cap into adapter for cooling system testerV.A.G 1274/9.
8. Clamp connectorV.A.G 1274 B/1 into adapter for cooling system testerV.A.G 1274/9.
9. Join connection pieceV.A.G 1274 B/1 to cooling system testerV.A.G 1274 B using connecting hose supplied.
10. Build up pressure to approx. 1.4 bar using hand pump on cooling system tester.
11. Renew cap.
12. Increase pressure to over 1.4 bar.
13. Renew cap.

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