My 2011 Cruze LTZ (49 000 KM) has had coolant leaks since day 1. Replaced water pump twice and I have topped up reservoir regularly. Last week my heater conked out and I called GM. The dealership found a leak and replaced part number 25193922. Apparently an air pocket was preventing the heater from working. So far so good. However, I am amazed at how much coolant has leaked from this engine from so many places!