These guys are giving you sound advise. It probably has to be one of the above. Step back and start trouble shooting. take lines loose blow air through cooler see if plugged. (note: cover end of line with rag so fluid does not spray everywhere.) Blow air through radiator cooler, blow air through cooler lines, drive again. If its not cured sorry bub, but the seal is shoot or their is an plugged internal passage. Sometimes new stuff goes bad or gets damaged even with the best care. Unless its really simple thing you are just missing there is not a magic bullet. Trouble shoot and get back to us!