When you say 'high temp' what do you mean? I've had the bird out in stop and go traffic on the 101 and have the temperature gauge start moving up quickly, but its never been a problem. Does the engine get hot? Yes, its an engine. Does it get hot and show any signs of running poorly, cooling failure, boil over, and anything of that nature? Never...
I think alot of people see the temperature gauge move more than a few degrees and overreact. Of course its going to get warmer, but that doesn't mean that the cooling system isn't doing its job....
What temps are you seeing on your 03 that you think are too high?