Hey Scotty. My 09 Corolla has been losing coolant and I have to top it off every week. The car isn't overheating and I did all the tests that you suggested. Pressure Tested it and it was fine. I did the combustion test to check if a head gasket was blown and it was fine. I changed the radiator cap with a new one and that didn't make a difference either. Any ideas how to find the leak next?

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it would overheat if you didnt' top it up. so to this video