[Vanya]

Originally Posted by JayG

Stop driving the car
Check the water pump and hoses
you can get a look at it by pulling the carpet behind the seats and removing the access panel
Porsche Boxster Water Pump and Thermostat Replacement - 986 / 987 (1997-08) - Pelican Parts Technical Article

probably not the head gasket

if its the water pump. its a reasonably easy DIY

Parts and coolant will cost you $350-400

Or you can have an indy shop do it, probubly add $300-400

What part of San Diego are you in? There are a lot of good shops that will not rip you off here

I'm from La Jolla/UTC