ok, i have a 1996 s-10 blazer 4x4 4.3L with 203,000 miles on it. around 150,000 miles, the radiator gummed up. water pump had to be replaced, and i had to have the radiator rodded. and at 190,000 miles, it did it again, but i just flushed the radiator real good, and put new orange coolant in. and now at 203,000 miles, it has done it again. a buddy of mine told me that the orange coolant is famous for doing this. anyone else had the problem? and, today, i flushed my radiator, block, etc, and made sure i got all the orange crappy fluid out, and i replaced it with green. hopefully the green won't gum up. this is a great truck. this is the only major problem i have had, besides replacing the rear axle, and rebuilding the transmission. she works hard for me in the woods, and always seems to get me out. i just hope her end isn't coming soon. lol. anyone else had the radiator gum up, and what did you do to fix it? has it happened again? i'll 'preciate ya'lls help.