If the mechanic is not a Porsche specialist, then he may not have know about the air bleed process for the Porsche. There are a number of posts describing it here, so do some searches to find out how. You might also find out what type of coolant he used to fill it up, if he mixed the wrong kinds together it will gel inside your engine.
In the future, do not take your car to someone that does not specialize in Porsches. The money you "save" will be spent (and then some) fixing their mistakes.
-james
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'01 Boxster S, 51k miles
'05 Mazda 6 Grand Touring Wagon
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