Expansion tank cap leak test | 
Checking the cooling system for leaks |
The cooling system is under pressure. The plug of the expansion tank is under the influence of the force of the spring, which opens and closes the system when a certain pressure is reached in it.
Increasing the pressure of the coolant raises the boiling point of the coolant.
A special pump is required to check the radiator cap. The pump is screwed onto the plug and pressure is built up until the valve opens. This must occur within the pressures indicated above. If this does not happen, the plug must be replaced. The pump and its installation are shown in fig. With the same pump, the cooling system can be tested for leaks. Installation of the pump on the expansion tank in this case is shown in illustration. For a 2.4 liter engine, the expansion tank has the shape shown in fig. Expansion tank of the engine 2.4 l, but the verification is done in a similar way. Create a pressure of 1kg/cm3 and check that the pressure gauge holds this pressure for at least 2 minutes. If the pressure does not hold, the system is leaking. The pump manufacturer's instructions must be followed when operating the pump.
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