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2015 stingray with a minimal coolant leak on the passenger side by the door. Pressure test is fine and it's not over heating. Has 27,000 miles. Could this be the reservior tank? The dealership cannot find it.
My 2016 Stingray with 27000 miles has an identical problem. Not only that, I found 2 or 3 folks with the same situation. After doing a bit of exploring, I removed the coolant tank and found exactly what the others had found. It's not the tank but the 90 degree fitting attached under the tank. It would be an easy fix if you could purchase just the fitting but GM has it set-up so that you have to buy $200+ worth of hoses along with a real PIA remove and install job that probably requires a lift.
I have, since I first found the leak, stuffed my hand underneath the tank and wiped my finger around the top of the fitting on occasion and sure enough, it comes out wet.with antifreeze.
It's hardly a dangerous leak but I don't like it and I'm not up for a road trip wondering if that fitting is going to finally let go.