Two problems related to radiator have been reported for the 2003 Porsche 911 Turbo. The most recently reported issues are listed below.
Coolant hose failure when the vehicle is run medium/hard. I lost 1/2 liter the first couple times in total, and roughly 1 liter of coolant the last time, all over the exhaust and rear driver's side wheel tire. Lucky I did not spin out or have many cars behind me. I captured pictures of the last leak after returning to my garage on 05/03/2013. Prior to the last leak, I had the front radiator replaced and the Porsche mechanic pressure tested the coolant system to ensure there were no leaks, as I had mentioned it would leak from near the rear driver's side. He did not find any leaks while the car was off and pressure tested.
Driving on private road and a radiator hose (in front of car) came off causing immediate and rapid purging of coolant on to all 4 tires and me spinning off of the road. Fortunately only into the grass on side of road. Car was flat bedded to mechanic for repairs. Spent several hundred dollars on repairs. Have since spent thousands on additional preventative measures due to mechanics alerting me that the hoses in the rear will let go and cause coolant loss. Had to pay for engine removal and welding of lines for my safety. Costs was well over $3000.