I have antifreeze leaking out from underneath the passenger's side, but the antifreeze container is still full.
An antifreeze leak may not affect the level in the overflow bottle. The leak may be the heater core or radiator leaking; a pressure test is typically used to locate the leak. I recommend having a mechanic, such as one from YourMechanic, come by and perform a thorough inspection to find the find and repair the leak.
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