1999 Chevrolet Silverado 1500, after 10 minutes of driving or warming up....?

bosco23300

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After 10 minutes of driving of warming up, the truck temp gets incredibly hot, I shut off engine to make sure there is enough fluid, and it seems as if all this dirty water and coolant is now filling the overflow tub. I was able to disconnect the the overflow and pour the nasty water out, and then fill the radiator directly, and after 10 minutes it did it again. After I shut the truck off, I can hear a girgling sound and fluid moving around. I just replaced the water pump so it is not that.... Any idea of what it can be???? Please help. Could something be blocking 1 of the lines, and therefore get a flush??? HELP!!!
 
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