Question about 1999 GMC Sierra
Stop at rad shop & have then add dye to your coolant, then check exhaust with black light for signs. I believe intake gaskets were problematic on those too. You may want to check a dealer for any TSB's. Either way, dye test will give you an idea if it's going out the tailpipe.
Posted on Jul 20, 2009
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Posted on Jan 02, 2017
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