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If the manifold causes a vacuum leak and eventually a coolant leak, is is possible for the coolant to leak into the motor?
sure. there are coolant passages in the manifold in the front and back. a breech of the gasket can cause an internal coolant leak to the oil as well as a vaccuum leak.
Q&A > GMC > 1999 GMC Savana 1500
Common Problems > GMC Savana 1500