1985 GMC S15 radiator fluid mixing with oil in engine

1985 GMC S15
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FRANKRIZZO89
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Engine Cooling problem
1985 GMC S15 6 cyl Two Wheel Drive Automatic

engine was overheating, we thought radiator had a leak, put leak product in radiator, truck started, but after going a few blocks it started belching smoke. We then found out radiator fluid was mixing with engine oil. Why? How do I repair this?
Mar 7, 2009 at 11:52 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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