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Originally Posted by ChrisGood
Go pick up a prestone flush kit from wal-mart or any local auto parts place, install it and flush the core. The fluid causes all sorts of gunk to build up in the core. My jimmy was an 00 and the core clogged in 03 with 60k on it. Installed the back flush, flushed it, refilled with the good old green stuff and not a problem since.
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Skip the do it yourself kit and get it done at a shop. Antifreeze is a toxic subtance and it's illegal to dispose of in the sewers, streets or storm drain systems.
Here is the EPA web page adressing the subject:
http://www.epa.gov/msw/antifree.htm