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Oh I misunderstood I thought it happened all of a sudden.if its perfectly ok when moving but the temp starts to creep up at idle I gotta go back to what has been mentioned earlier not enough either air flow or water circulation(or a combination of both) but you've covered about everything so something that has already been touched on is not doing it's job. If I had to GUESS if I was sure that there was plenty of air flowing thru the rad then I would bite the bullet & get a better radiator(more area,more cores).The more I think about this if it was my deal I would buy a GOOD radiator.



I have a GOOD rad, actually it cooled fine last year it's just this summer. I don't want to throw parts at this and waste $$$$, everything is new....it's gotta be something else; the cooling system is fine. You can feel the air flow at idle at the grille outside the car and it feels quite strong. If i open the hood you feel tonns at air come thru the rad. it easily sucks up a sheet of paper to the face of the rad...i don't see buying a new rad as a solution...