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Our 1996 Lumina has tar buildup in the expansion tank, so i would assume it is built up in the rest of the cooling system. My question is, Is there a product like auto rx that safely cleans cooling systems without fear of clogging? I know this is the wrong forum, but I think I may get more response here. Thank you.

Here is a link to a picture of a towel that was just dipped in the coolant, it is black:

http://us.f1.yahoofs.com/bc/3a59c1de/bc/Sludge/DSC00540.jpg?BCnPlTBBrLzRcER2
 

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IB4TM :D
Anyway, its more than likely from ethylene-glycol based coolant being added to the tank, when GM has used DexCool for a long time. The two CANNOT be mixed.
Two good flushes, add the proper coolant, and you should be good to go.
 
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