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Re: 2000 astro. smelly heat/defrost when on
The smell/noise is most likely a leaking heater core, there is no fix, replacement only.
Air distribution problem is a cracked, leaking, or broken vacuum hose between the vacuum fitting on the PCV valve, (driver side rocker arm cover) and the vacuum check valve under the hood, (passenger side), near the A/C accumulator.
Hope this helps
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