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Message: <blockquote data-quote="jarance" data-source="post: 437216" data-attributes="member: 21">Pressure test does not not verify that there is NO leak. I used to do pressure test and it does not detect the leak.There is one sure way to check leak. First fill the radiator with water. Warm up the engine. When it is hot, OFF the engine and check for water droplet from the bottom of the car. You might have to remove the bottom cover to see the source of the water droplets. trace the water droplets and the chances it is from the radiator connection where the rubber hose is connected. Usually you will find a hairline crack at the bottom of the plastic part of the radiator connector.Another source of the leak is the expansion tank. I have the leak problem and actually change the radiator, expansion tank and rubber hoses to stop the leak. Note it is recommend to change the thermostats (2 nos) as well to have trouble free with the cooling system.</blockquote>