Steve's right, happens often.
Unfortunately heat-soak is a powerful thing. When you turn the vehicle off the coolant system stops moving and the engine's heat still transfers to the coolant. During the first minute or so it's really bad, and it heavily pressurizes the system. you likely won't see much unless you're checking right after shutdown, and even then, you have to be quick so it doesn't mask where it's coming from. It could be the hoses going to/from the heater core, turbos, etc. Have a friend help you by SAFELY getting eyes on a few hoses while it's running (after a hard run), then have your friend shut the car down.
Be careful, and quick. You might be able to pinpoint it without guesswork.
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23:55:35 11/19/10
