Checking the cooling system for leaks (Audi 100 C4)

Defective areas in the cooling system are easiest to identify when the engine is hot and, accordingly, the operating pressure in the cooling system. But in this case, gloves are required to check the hoses, otherwise you can get burned.

TO 10

Are there any leaks in the radiator and engine hoses, including the hoses to the heating system?

Cracks in the hoses? By kneading, determine how hard the hoses are - in the latter case, they must be replaced immediately.

When kneading the tubes, it is possible to identify damage caused by rodent bites.

How far do the ends of the hoses extend onto the corresponding fittings?

Are the clamp bolts tightened?

Rusted clamps may stick unexpectedly while driving and under full operating pressure in the cooling system. Replace!

The workshop monitors the tightness of the cooling system using a special hand-operated air pump and a pressure gauge.

This device is installed on the opening of the expansion tank and a pressure of 1 bar is pumped up.

If the pressure does not decrease within 1-2 minutes, the cooling system is considered sealed.