Sorry if theres already a thread on this but I've searched and searched for an answer. I have an 03 WRX Wagon and when I get out on the highway the temperature will rise when Im in 5th gear and before it gets to the red I either rev the motor or downshift into 4th and give it some gas and it creeps back down to normal temperature. Then when i go back to 5th gear it does in again??? I've read that the 03 radiators suck. Does anyone have any suggestions before I trying buying a radiator? I took the thermostat out and put it in hot water and it opened up.