Well, this past weekend I added another bottle of water wetter and at first i thought i saw a difference in temp as it stayed below the middle mark, but it was only 70 degrees out at the time. Later in the day it of course got hotter(87) and while i was sitting in traffic the temp rose again above the middle mark as it usually does so im not sold on it! When do the fans kick on automatically because it seems mine do not kick on at all except when i first take the car out and as the temp rises to almost half way, i hear them for about 5-10 sec then cut off. After they stop, I rarely hear them kick on again.