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Message: <blockquote data-quote="jarance" data-source="post: 414093" data-attributes="member: 21">Do you mean the bleeder valve when you are filling to purge the air bubble?Pressure test does not really and not always to detect leak when the leak is very minute.Usually, the leak are located on the radiator, expansion tank and the rubber seal at the temperature sensor.You need to dismantle the expansion ans inspect it closely for hairline crack by looking for water or brownish stain. Sometime the crack is at the bottom of tank or nozzle connection.For M43, I think that there are some water hoses at the rear side of the engine. If the leak is there, it is quite hard to detect.Would advise to change all the water hoses and expansion tank. It the leak persist, then it is advisable to change the radiator as well if the usage of the radiator is more than 3 years to 4 years old.Oh yes, there is one way to check for leak. Start the engine and warm it up for about 10 minutes. When the engine is hot, turn off the engine and check for leak or water droplet at the bottom of the car. If there is water droplet, you can then trace the source of the leak.</blockquote>