Insert the pressure gauge pipe into the expansion tank fluid filling hole. Using a hand pump, create a pressure of 1 bar in the system. If the pressure drops, find the leaks and eliminate them. These leaks are detected visually by fluid leaks.
If the system pressure drops without a coolant leak, it may be due to internal engine problems, such as a faulty cylinder head gasket or cracks in the engine case.
To check the radiator cap safety valve, connect the pressure gauge pipe to it and create pressure with a hand pump. At a pressure of 1.2-1.35 bar, the valve should operate.
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