Volkswagen polo has a new heater. What's the matter with the water tank always open?

1, the cooling water of the engine water tank reaches the boiling point, which produces a lot of steam and bubbles. Part of the cooling system is occupied by air bubbles, which will cause serious water shortage around the cylinder wall, thus causing insufficient cooling of the engine, reducing the strength of the piston, piston ring, connecting rod and other components, and even deforming them, which can not bear normal loads. At the same time, it will also destroy the normal gap between parts, making it impossible to maintain normal oil film between parts.

2. Selection of antifreeze: the freezing point of antifreeze is lower than the lowest temperature in winter 10℃. The price of mainstream brand products of antifreeze is basically 40-60 yuan per barrel, with a capacity of 4 liters (generally, the fuel tank capacity of a car is almost 4 liters). The original concentrated antifreeze may be a little expensive, generally about one bottle in 80 yuan, with a capacity of about1.5l. When replacing antifreeze, it needs to be added in proportion. Generally, the ratio of antifreeze to water is 1: 1 or 1:2.

3, antifreeze replacement cycle and replacement method

Different automobile manufacturers suggest different replacement cycles for the original antifreeze, but most of them suggest that the owner should replace the antifreeze every two years, and some manufacturers show that the replacement cycle of the original antifreeze is 4 or 5 years. But in any case, in short, we have to change, which is nothing more than the length of the replacement cycle.

When replacing antifreeze, the first and most important step is to wait for the vehicle to cool down. Never replace antifreeze when the engine is at high temperature. On the one hand, there is a danger of scalding, on the other hand, releasing antifreeze during "hot car" will also affect the cooling of the vehicle.

5. When adding new antifreeze, you can directly pour about 3.5L (depending on the vehicle type) of antifreeze into the liquid storage tank, and stop filling when the liquid level reaches the upper limit MAX position. At this point, unscrew the drainage screw next to the water supply pipe and continue to add antifreeze. After seeing that there is no air bubble when antifreeze flows out of the drainage screw, tighten the drainage screw. At this point, the work of adding antifreeze and releasing air for the first time is basically completed.

After that, start the vehicle and idle for 3-5 minutes to make the vehicle enter the normal working temperature, so that the newly changed antifreeze can be fully circulated in the waterway of the vehicle. Then turn off the engine and open the liquid storage tank, and the liquid level will drop. At this point, just add an appropriate amount of antifreeze to keep its liquid level between MAX and min.