[Masonite]

i would let your car sit and idle for about 10 minutes with the hood up in your driveway. see if after it hits "normal operating temperature" that the fan/fans kick on for the radiator. for most f-bodies, the fans will turn on while driving under about 30mph, to keep the air flowing. higher speeds don't need the fan(s) because, obviously, there's air moving through the radiator. anyway, the point I'm getting at is that from the sound of it, yes, there might be a problem with one or both of your radiator fans--they might not be turning on at all, if you haven't noticed already. first thing i would check would be to see if they're plugged in right. sounds too simple, but it does happen XD. after that, I would check the water/temp sensor.