If your coolant level is dropping to the point where you have to regularly refill the reservoir, it's either leaking externally or being burned up in the engine. If you're certain there are no external leaks, then the most likely cause of the issue is a failed head gasket and or warped cylinder head. The best way to test the cooling system is by use of a cooling system pressure tester. This tool can be purchased online or at most automotive parts stores. There also may be an auto parts store nearby that will loan you this tool. Take a look at the article below for specifics on how to perform this test.
https://www.2carpros.com/articles/radiator-pressure-test
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Sunday, November 3rd, 2019 AT 2:46 PM