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Re: Photo of original heater control valve install?
You believe they flow water backwards too when in the open position? There's no particular reason they shouldn't, but no reason they must either. Mine doesn't flow, so I presume the vacuum is wrong, but it was also backwards.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought
1969 Pontiac 2+2 427/390 4-speed Coupe
1969 Pontiac 2+2 427/390 4-speed Convertible
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