I have a 2015 Cruze we bought it with 29k miles in March 2017. I have filled the coolant reservoir tank up 4 times since buying it. I took it to the dealer with 35k miles on it 3 weeks ago. They pressure tested and found no external leaks. Today the service guy told me they were going to remove the intake manifold and check it. Does coolant pass through the intake I have never seen any that do and they are going to see if it is going out the exhaust. Then if that isn't it he said they were going to start tearing the motor down. I have already opened a case with GM 2 weeks ago about the multiple issues that we have had such as the car being in park and going down the driveway in park.