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Message: <blockquote data-quote="Guzzler" data-source="post: 31145" data-attributes="member: 3647"><p>Dear Si Fu and Bros,How much water should I lose weekly  from water tank to radiator ? Car is year 2007. 1. Before change of water coolant pump (due to fault reading) I was losing 0.2 liter every week and topped up.2. After water pump change lost more water = 0.4/0.6 liter per week. reason was the new water pump more powerful and caused the radiator to leak more water ( leak was not so evident before the change of pump).3. Changed pump and thermostat = still note loss of water around 0.2 to 0.4 liter.Sent back to shop to check for leakage, and nothing detected. Also checked no oil in water or any signs of cylinder head crack ?Please advise what may be possible causes of water loss ( have not been stuck in any traffic jams).Best regards,Guz</p></blockquote><p></p>