[ahirt]

I had the same problem. You could hear the water boiling in the engine when I shut it down. I tried back flushing, front flushing, TSP, Cascade, Rust 911, left vinegar in Radiator out of the car for 1 month. Nothing helped. I finally bit the bullet and bought a new Heavy Duty radiator from Brattons. It fit great and my temperature doesn't go over 170 even on 95 degree days just idling through the neighborhood for 30 min.