My 2007 Corvette thermostat failed. I had it replaced for about $200. The next day, I drove the car, and it failed again. I took the car somewhere else. I had it replaced again and the very next day it failed again. The car is not overheating. The thermostat simply gets stuck open, the ac won't work during this, and the dash reads that it is overheated and the ac is shut down, and the gauge shows no temp. I have no leaks and smell nothing. I notice when this happens, I hear a louder sound from the fans just after it happens like the fans are running faster. What do I do to get this fixed.....?????