bleeding coolint on 300tdi

hi guys im needing sum info plz im at the end of my teather with my disco,fitted a new core plug 2wks ago cos old 1 was leakin not 2 bad a job 2 do, toped it up wif coolint and thought the job was a goodin coz it wasint leakin anymore, drove home frm mates garage about 5miles frm wher i stay and noticed tht disco was hotter than ushal on temp gauge and i had no heat cumin through the heater vents so i stoped and had a look and ther was water getiin forced out of header bottle and the pipes frm radiator, ive followed the bleeding prosedure in manual and stil no luck does any1 hav any tips i cud go on,as i thought it was an easy task 2do. cheers steely

Hi I usually jack up front o/s so the radiator bleed cap is the highest point then push down top hose to get the air out but that is on a v8