My truck was doing this exact same thing to me. It is indeed vacuum
oriented. Just take it to your dealer and tell them you need a bigger
vaccum reservoir for your check valve. They'll know what you're talking
about once you explain to them what is happening.
John Clawson wrote:
> My admiration for Dodge engineering notwithstanding, here's something I
> don't quite understand. Perhaps someone can enlighten me.
> When set for passenger direct flow and max fan(only on max?) my A/C
> periodically changes its mind and blows out the defrost vents and then
> returns to normal again.
> When new, this seemed to occur at the whim of the machine. Now it seems
> to happen only under extreme(reasonably) acceleration and when I lift it
> returns to normal. Its like vacuum oriented.
> I know some A/C systems use engine vacuum to move vents but have only
> seen that with driver's direction.
> Is this DC's effort to better cool my cab by spreading the air around?
> Do I have crossed vacuum lines from the factory?
> Is this little 4.7 so starved for air that its taking it away from me?
> (Quickd on the way)
>
> Be gentle, first new truck in 12 years.
>
> TIA,
> jc
> 00 cc,4.7,4X4,auto,Flowmaster40,Jet chip,etc.
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