Jetta throttle water pipe is blocked.

The main reason for excessive pressure is the blockage or blockage of the circulation system. First, let's see if the heater reduces the heat. If so, the heating box is blocked, which will affect the small cycle. If the page drops behind the kettle, the cold car unscrews the lid of the kettle and finds that the water suddenly rises due to excessive pressure, indicating that the backwater is blocked. Let's see if the backwater metal pipe is blocked by embroidery rust inside. Just blow it in a simple way. Replace or cut off, dredge rust with iron wire and connect with rubber hose. When the fuel return pipe of the fuel filler door