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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Not long. That stuff will mostly settle to the bottom and clog the radiator after awhile. I would start looking into a replacement before it leaves you stranded.
Awhile back I worked on my friends 97 Ram. I got a new radiator from a local radiator shop (Roppels Radiator) for about 1/2 of what AutoZone wanted for one. Lifetime warranty andd it cools the 360(5.9L) great. You might look into a local shop.