Been looking at a possible diagnosis and I’ve seen everything from thermostat, to water pump, to head gasket etc. I’ll provide as many details as possible. My Cruze is the 2016 LT 1.4 turbo. 93k miles. Had the dreaded turbo failure back in February. Everything was fine until a month ago. Started noticing I was loosing coolant, refilled and I was good for a week. Engine started to overheat, pulled over popped the hood and reservoir was empty. Saw a little bit of coolant pooled up under the hoses, filled back up and drove the rest of my 5 minutes home. I had lost my job until recently so no real driving but noticed if AC was on coolant would leak faster. Had a cold snap around Thanksgiving got home and noticed steam pouring out of car after 15 minute drive. Popped hood and found it coming from a crack in the water outlet connector flange. Ordered the part and replaced. No more leaks and with a handful of short drives noticed no issues. Drove a little further today, maybe around 100 miles. Car starts overheating, pull over pop the hood and coolant levels are exactly where they should be. I see no more leaks but still overheating. Let my car cool down put heat on full blast and I was fine for the 15 mile drive back home. I even noticed with the heat on the temp would drop just a little lower than normal. Check engine codes only read related to turbo, but that was just replaced and I’ve noticed no problems there? Really scratching my head here.