Topic: 2010 Camaro SS weird cooling issue
Ok so heres some history, this car is becoming more of a pain in my ass than the race car.....
Before we start at no point has the car ever overheated during any of these scenarios.
2010 Camaro SS LS3 V8 M6 72k miles. At 55k miles 3 years ago I had a collapsed valvespring, car was towed to dealer and top end parts replaced, drivers side headgasket replaced etc. Got the car back it was perfect. 1 year later the drives side catalytic converter failed (due to last years valve spring problem most likely) while being replaced I had coolant flushed. Car is great. Fast forward to last year radiator blows. I swap radiator out, fill up with coolant, burp the system (or so I think). Car is rarely driven until march of this year about 500 miles later and I am parked on a slope nose down and notice coolant leaking from overflow tank. I think its cracked so I replace it, Refill and go. Leak returns, I realize that I have overfilled coolant which was the problem in the first place and its coming out the overflow hole. I drain a bit, all seems good.
Park in garage one day I hear boiling coming from overflow tank? Strange but nothing leaking. Drive again next day, boiling again now a little less. Drive again boiling goes away, no loss of coolant. A month later boiling loud, coolant sprays out of tank overflow all over the place, big mess. I check no leaks, no nothing, I park car on slope in other direction making radiator highest point, I burp the system multiple times. All seems good, coolant cycling, fan turns on and off, etc. All seems fine. Come home one day and I notice faint boiling sound, but nowhere near what it ever was before. I let it go. Noticed it a few more times but always faint no leaking, coolant levels seem fine.
Fast forward to today, driving home and car never warms up, coolant gauge is full cold, digital gauge shows --- , oil temp gauge is full cold. Message shows on dash saying "AC Turning off Engine overheating". I pull over cooling fan is on, radiator is warm but not hot, engine is warm but not hot. Ran heater hot air coming out. Drive home and after 30 minutes of driving I am able to open radiator cap and not burn myself/boil over. Coolant overflow tank is low but not empty, radiator is full, upper radiator hose was soft (both when I pulled over and when I shut off). Oil does not have coolant in it. NO white smoke from exhaust, engine runs perfect no codes. I am able to touch both engine and radiator and not burn my hands.
Anyone have any idea what the hell is going on? I mean with coolant loss like that I'm thinking headgasket but it wasn't that much gone, and as I said no white smoke at all. No smell of coolant burning anywhere. Also something had to be cooling the motor, it is not even hot or overheating. Is there some sort of giant air bubble trapped in there?
I'm at a loss.....