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If it has the 4.3 ltr engine, the intake manifold is notorious for leaking at the back of the engine where you cannot see it. Try using a mirror at the rear of the intake manifold and look for wetness. Replacing the gaskey is the best fix.

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Q: You have 1998 Astro van and have an antifreeze leak you have checked and replaced all the belts Where could it be coming from?
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