I own a 2006 Chevy Cobalt and I've come to a final decision that the car is a piece of junk and totally hate it. The coolant temperature goes up to 255 and I checked for leaks but found none, I changed the thermostat and the coolant temp sensor but in vain. I've spent hundreds of dollars trying to figure out a solution for this stupid car. The engine coolant fan does not turn on inspite of reaching high temperatures. The fan works when I turn on the A/C. I'm just fed up with the car and totally hate it. What do you recommend me do?