Re: vacuum hose for vents and defroster
In short, yes.
There is supposed to be a vacuum res (ball), but mine broke, so running off straight manifold vacuum now. There is what appears to be a check valve? cut into the factory line. function would have to be investigated.
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'86 C-30 dually, 454/tbh400
'73 K-20 350/350/205 (sold  )
I'm kinda like duct tape- no real purpose, but handy to have around.
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