Check engine light coming on and off and greenish fluid leaking.

I recently purchased a 2010 equinox with 35000 miles on it. Need to know whats wrong with vehicle its very hard to keep dealing with dealer they r giving me the run around. I recently took it in for a check engine light coming on and off and greenish fluid leaking. They replaced a fuel system sensor and the they replaced the compressor. The next day we notice lights turning on and off in dash radio would go black but still work then the screen would appear again.

The morning of day 2 the vehicle would not start had a message of battery saver in on dash system alert screen. We called dealer they said bring it in we had to jump start it but it did work in getting it there. After 3 hours they came up with we have a bad battery which isn't covered so we left and were gonna get a new battery but autozone said our battery was good after putting tester on It we then went to another auto parts store where there tester confirmed good battery. We r on day 4 now and will be taking vehicle back again because stuff keeps shutting off in vehicle. Is there any issues I should be aware of with computer system.