The truck is a 96 with the 46RE A/T.
The local Dodge dealership tech said it is needed to maintain the "prime" in
the pump when shut down. This seems backward to me, generally the prime has
to be maintained between the source (sump) and the pump, not beyond the
pump.
Is Dodge implying that leakdown through the pump of ALL the fluid in the
cooler lines will occur without the check valve since the return line
empties into the A/T case above the level of the fluid in the sump, i.e.
"vacuum-break syndrome".
Donald Mallett wrote:
> What year truck and type of tranny?
>
> --
> *-------------------------------Y2KOTA-------------------------------*
> Don Mallett
> Y2K QC 4.7L Auto SLT+
> http://Geocities.com/maldbnsf/
> http://www.dakota-truck.net/profiles/dakota/QwkvWz@DAJFf6/profile.htm
> *---------------"So long and Thanks for all the Fish!"---------------*
> D. Adams
>
> In article <3D9112D3.B643E46D@qwest.net> , whatelse@qwest.net ("Dennis &
> Becky Anderson") wrote:
>
> >
> > Does anyone know or have a guess as to why there is a spring
> > loaded check valve in the A/T cooler tubing located just
> > ahead of the radiator coil ? The spring pressure is
> > minimal, someone with healthy lungs can blow into the valve
> > and unseat the stopper, so I doubt the valve is regulating
> > pressure. Since the A/T cooling is a closed system, leak
> > down should not be an issue and back flow should not be
> > possible. I'm considering removing it to eliminate any
> > restriction it might be imparting to the fluid flow.
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