Checking the tightness of the control system (VW Transporter T4)

If there is no oil in the expansion tank, it is necessary to carefully check the tightness of the system.

1. Start the engine and let it idle.

2. Turn the steering wheel to the right and left until it stops and hold it for a short time. This will create the greatest pressure in the pipes.

3. In this position, perform a visual inspection to check for leaks:

• piston valve;
• toothed rack seals (to do this, loosen the hose clamp of the corrugation by moving the corrugation to the side);
• vane pump;
• pipeline connections.

(The information is presented on the website: «VWManual.ru»)