04 auto GT 60000 miles new engine at 55000

Coolant leak happened slowly at first then it became a major issue as it was all over the front half of the engine bay and even in the bumper ( like so many other rx8s from what i read) I thought it was the coolant reservoir tank and replaced it but as i was taking out the hose to the radiator i realized how disintegrated the plastic tip was to the top of the radiator.... So I bought a bhr radiator and new racing beat hoses.... just installed them with no problems and showed no signs of leakage and everything was holding coolant. I turned on the car and ran it for five minutes with no issues and started to pack up my tools thinking i was done however i decided to turn the car back on and run it like the shop manuel said 5 mins at 2500 rpm and then 5 mins at 3500 rpm .... everything was okay when i was in the car and no lights were on i turned off the car and then got out only to see the car spewing coolant everywhere ( understatement) i know all the hoses and radiator were connected the right way and triple checked every part... I am wondering if there is anything else i did not think off or if any of you had this issue???? I pulled it up searching google with little to no success since everyone just had simple fixes and the threads are clogged!!!!!

Any help or insight would be appreciated i dont want to give up and take it to the dealer since they will probably just lie or argue with me since i bought aftermarket... Thanks !!!

 

t stat/water pump. could have air in the system