I have replaced the thermostat to no change, it is needing coolant every month or two, but not leaking any. I put some radiator stop leak in the coolant and it slowed down usage some. I have only had the car for less than a year and am not sure about the age of the coolant, so I am about to do a flush on it and put new coolant in, the coolant now is a milky kinda goldish color. The fans come on but don't seem to be helping cool it down. I cut the heater on when it starts running hot, but it never helps much and the air coming out is only lukewarm, not hot.