Tiguan water temperature is normal. Once the flame is turned off, the antifreeze will boil.

Does the subject want to ask "Tiguan water temperature is normal?" What is the reason why the antifreeze boils as soon as it is closed? " The reason for this is the following：

1, the engine cylinder head is not tightly sealed, which causes water vapor to enter the antifreeze and causes the antifreeze to boil. This situation is generally accompanied by the increase of engine fuel and the thickening of engine oil.

2. The lack of oxygen in the engine intake leads to incomplete combustion, which produces a large amount of water vapor, leading to the boiling of antifreeze. This situation may be caused by the failure or blockage of air filter, air inlet, throttle and other components.

3. The water pump in the cooling system is damaged, which leads to poor circulation. After the engine stops running, some coolant is still heated, which leads to the boiling of antifreeze.