Radiator fluid leak
 

Whilst using my Boxter on a track day, Ltres of radiator fluid poured out from in front of the right rear wheel as soon as I returned from the race track into the pits. Additionally, there was radiator fluid sitting on top of the recess where the oil and water cap is located. After letting the car cool down I topped the radiator back up with tap water and drove home without any leaks. What happened at the track and what do I need to do to prevent a recurrence?

Sounds like a bad cap. Overflow is in front of the right rear wheel. Fluid comes out of the cap and drains out just to the right of the oil cap. Fluid got hot and expanded. Old cap couldn't hold pressure.

John

Could be a cap, could be air in the cooling circuit, or if its an older car, the coolant tank could be cracked. Pull up the carpet in the trunk and see if there is coolant on the trunk floor. If there is, its the coolant tank. Look for leaks in the entire cooling system. That means getting under the car and checking all the hoses and radiators.

If there are no visible leaks, bleed the cooling system. If you don't know how to bleed the cooling system, look it up at the Pelican site or Pedro's Technolab site. Don't fool around with overheating in these cars. A brief overheating episode can lead to catastrophic engine failure.