surely it's down to a knackered component somewhere in the system. they didn't leave the factory with overheating probs did they? replace the thermostat, give the system a good flush and make sure there isn't any air in the system, might even be worth buying a new rad. unless your engine is heavily modded with big boost it should run as cool as a standard car. if it was me i would remove all the hoses to and just double check things, refill with antifreeze/summer coolant and hopefully you'll be cooler than an eskimo's arsecheeks