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Q:

intake manifold on 1999 GMC Savana 1500

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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?
(1) Answer
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.

Roy