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Note: you may also have air in the system... If you search the Tech posts, archives posts, you'll find the procedure on how to BURP the system....
Basically: Pop the Rad cap (but leave in there as a cover), start and let it get up to operating temp (look inside radiator to see if fluid is moving) BE CAREFUL ITS HOT, have someone gas it to 2000 rpm and hold it there while you add more antifreeze (50/50 mix (50 water/50 antifreeze) until its filled to the Rad cap neck, then replace radiator cap, secure it, then let off the gas.