Radiator — checking the serviceability of the tank cap valve and the tightness of the block (Renault Espace I)

1. The cooling system is under pressure. The expansion tank cap is equipped with a valve, which is designed so that it opens when the pressure increases by 0.8 atm. When the coolant expands, the pressure increases, which leads to an increase in the boiling point.

2. A special pump is required for testing. Place the pump on the cap and use it to open the valve. This should happen within the maximum allowable pressure. If this does not happen, replace the cap. Using the same pump, you can check the cooling system for leaks by placing it on the radiator filler neck or on the expansion tank. Set the pressure to 0.9 atm. and make sure that the pressure gauge indicates this pressure for at least 2 minutes. If this does not happen, there is a leak in the cooling system.