3.0 Car radiator without air conditioning
1 - fixing latches
2 - boost air cooler (intercooler)
3 - self-tapping screws
4 - fastening of a radiator of air of pressurization
3.0a Car radiator with air conditioning
5 - radiator guides
6 - evaporator
7 - fastening bolt
A certain pressure is created in the cooling system. The cap on the neck of the expansion tank has a valve that opens when the pressure in the system reaches a certain value (1.4 bar). To check the condition of the expansion tank cap, a special device is required (pump), to create the required pressure. The cap of the expansion tank is screwed onto the pump, which pumps air until the exhaust valve on the cap opens. The opening of the valve must occur within the nominal overpressure values. If the valve operates at other pressures, the cap must be replaced.
The bottle cap valve test pump can be used to test the cooling system for leaks. To do this, the pump is fixed on the filler neck of the radiator or expansion tank. With the help of the device, a pressure of approximately 1.0 bar is created in the system. It is necessary to monitor the readings of the device so that the pressure in the system remains at the indicated level for at least 2 minutes. If the pressure decreases during this time, then the system is not tight and there is a leak somewhere. The location of the leak is fairly easy to determine by the fluid flowing out under pressure.