Jimberg has addressed the issue of air pockets, but I dont think it has been looked enough. It seems pretty elementary, but having air in your cooling system can be a big problem. The way I was taught to get all the air out was, run the engine with the radiator cap off until there are no more air bubbles popping up. If you experience water shooting out of your cap (and your sure the system isnt full) there is most likely a huge pocket of air somewhere in the system. of course thats just my opinion, i could be wrong.
andy
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