| 摘要 |
PROBLEM TO BE SOLVED: To provide an airtightness testing method of a heat exchanger having an oil cooler built in a radiator tank, which improves workability and tightness test accuracy of the oil cooler. SOLUTION: The airtightness test of the oil cooler 2 is performed by a gas detecting means 9 communicated with a radiator 1 in the state where the heat exchanger A having the oil cooler 2 built in the tank of a radiator 1 is stored in a vacuum-suckable inspection chamber 5, the radiator 1 is evacuated, and helium gas is supplied into the oil cooler 2. Then, in the state where the inspection chamber 5 is evacuated and helium gas is supplied into the radiator 1, the airtightness test of the radiator 1 is performed by the gas detecting means 9 communicated with the inspection chamber 5. COPYRIGHT: (C)2007,JPO&INPIT
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