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Your gaskets are leaking and you are leaking antifreeze inside the manifold. Same thing happened to me on my silhouette and cutlass. The problem is the orange anti-freeze eats the gaskets. Will cost $2,000-to-$3,000 to fix. Sorry!

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Q: 1999 olds silhouette has smell of antifreeze on outside of motor only no visible leaks and have changed cap although heater does seem to be losing heat not as strong but no smell inside nor overheat?
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