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    red1980 Posts: 1, Reputation: 1
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    Feb 15, 2010, 07:58 AM
    2003 dodge heater runs with a/c
    I just bought a 2003 dodge ram van with the 8 cyl engine, everything works great except 2 things. I still get hot air when I run the inside temp control to cool, seems to be a vacuum thing was when the engine idles I get cool air but when the engine is under load I get only hot air. There appears to be 2 vacuum valves under the hood, does anyone know which one might be going bad?

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