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That vacuum line originates at a T fitting at the vacuum reservior (about a 5" black ball) located near the right front inner fender, about 2" forward and right of the engine block. A larger tube supplies the vacuum from the right rear of the upper intake manifold (plenum) fitting. This tiny plastic tube is prone to drying and splitting in the area that is exposed to engine bay heat before it goes into the wiring harness loom, so give it a good look over there. Also, the manual valve in the controls gets loose from use and will loose vac there, I've made special and cheap kits to repair this. On my '95 Astro I had only 5" of vacuum at the fitting on the plenum, a new gasket brought it back.

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โˆ™ 2006-06-23 02:02:22
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Q: Where do you reattach the vacuum hose that controls the heater on a 97 Chevy Astro van?
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