Bleed the coolant
 

I know for sure that I have to replace my water pump (coolant pump)but I really concern about how to bleed the coolant for take the air out, please some body help me with this issue :o

if its anything like the Saab it SHOULD bleed itself out...I just did a thermostat on the Saab and I just filled the reservoir up after I replaced it, ran it till it was good and warm, let it cool down and filled up the reservoir the rest of the way, it does not run hot or anything so I guess I did it right.....my boxster already had the waterpump/thermo replaced so I dont know how the PO did it

This is exactly "how to kill a Porsche"; with these cars being mid engined, the radiators are so far away from the engine, and high enough up, to cause air entrapment, steam pockets, and cracked cylinder heads if the cooling system is not either filled under vacuum or manually bled after filling.

Do a search, check Pedro's site for instructions on how to do it correctly before you start. Doing it the wrong way can be fatal................