I have a Honda Civic Del Sol Si, and it overheated the other day. I just moved into a hot town, and the other day, I started it up, drove about 15 blocks and it overheated. The fan works, and at Idel, the car stays at the right temp. The problem only occurs when I let out the clutch and drive. It overheats very quickly. The car cools off when I push in the clutch and let it idel. I am not sure what is wrong. It happened out of nowhere.