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Old 09-11-2010, 12:58 PM   #11
chevy72pu
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Join Date: Jan 2009
Location: Sandersville, GA
Posts: 298
Re: Water Valve Heater

I had a similar problem on my 72. I bought a new valve and installed it. Still hot in the cab. Finally found a vac hose loose under the dash. Reconnected it and things got a lot cooler. AC was running the whole time, it was just mixing hot air with it. Maybe this will help.
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