Once in a while when I turn off my 2001 boxster S, coolant begins to flow out of the rear. There were not panel indication that the car was overheating. Any suggestions?

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Try a new radiator cap, maybe it cannot hold the pressure during the heat soak. Also you may have to bleed air out of the system.

- Nick

Pull up the carpet in the trunk to see if your coolant tank has cracked.

When I bought my 986 at an auction, I drove it back to my house and there was a large coolant leak in the trunk. I thought it was the cap too. I replaced the cap and it didn't fix the problem. I ended up taking it to a shop and they couldn't figure it out either. I ended up removing the carpet out of the trunk, inspected the coolant hoses, disconnected the hoses from the coolant overflow tank, and removed the tank. Upon close inspection of the rear of the tank, there was a strange fatigue crack in the rear of the tank (facing the front of the car). I replaced the expensive tank and it fixed the problem. I was very disappointed in the Porsche here. The car at the time had 60,000 miles. Good Luck!

- Justin

Expansion tank is a common problem

Mike

One word......Penicillin

Also double check that the bleeder valve itself did not start leaking. Our's has done this twice. The first time it was the cap and the 2nd time it was the bleeder valve. The bleeder valve is normally replaced when you replace the tank but can be ordered separately when the tank itself is fine as was our case. Our car is a 987 but the part had a 986 number so I assume that they use the same one.