My GTM usually runs from 215-225, which seems okay to me for what LS engines typically run in Corvettes, but I have always been concerned that it is too hot. On Thursday I got into a traffic jam, and it was a hot day in South Florida, so it started going to 230 and maybe even a bit over that. At 230 I started getting concerned about it, but thankfully after it hit a bit over 230 I was able to get onto the turnpike and temps went back down into the 220 range. I have no idea where the fans are coming on and off. This car has a 575HP LS2 crate engine that came from Texas Speed and it has their ECM, but I really do not know where they set their fans to come on and off. My understanding is that on a factory Corvette the primary fan does not turn on till 224 and the the secondary turns on at 238. Is this correct? Would Texas Speed leave that stock? I know these engine run hotter than most, but at what point are you really having an issue? Looked at a bunch of threads which talked about air being caught in the system, most of those cars just overheated, could there be a bit of air in the system?