Ok guys I need some help. My wife has a 1993 Lexus ES-300 and it is beginning to overheat. I drove it to see what it was doing. The temp gauge needle is erratic. With about a 2500 RPM I could get it to maintain a steady temp, but as soon as the gas was let off it would rise quickly. This leads me to think it is the thermostat, correct?
The odd ball part is once the temperature controls are put to auto the A/C light starts blinking, which it has never done before. One of the belts erratically emits a squeal, which leads me to think water pump, but that doesn't explain the flashing A/C light and again confirms the thermostat.
What do you guys think?