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1.Prepare a clean oil receptacle.
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2.Blow compressed air into the oil passage shown in the figure and drain the ATF in the oil cooler.
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3.Dispose of the ATF in the oil receptacle and clean the oil receptacle.
4.Add water into the clean oil receptacle.
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5.Cover the oil passage by hand.
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6.Immerse the oil cooler in the water in the oil receptacle to the level shown in the figure.
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7.Blow compressed air into the oil passage shown in the figure, apply compressed air pressure to the oil cooler for 3 min, and verify that there is no air leakage from the part which was soaked in water in the oil cooler.
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8.Remove the oil cooler from the water and wipe off any water remaining around the oil cooler.
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9.Dispose of the water in the oil receptacle and clean the oil receptacle.