Napa has an AC flush that they sell that works well but is expensive.  I
have used that before.

Ken

On Fri, Jul 22, 2016, 2:52 PM John Rodgers <jrodgers113@gmail.com> wrote:

> Thanks Ken. There is something the that is definitely not right -  maybe on
> both vans.
>
> On the '88 the fan comes on, but in high speed mode. It cycles like it
> should.
>
> On the Carat, the fan simply doesn't come on. Fan works fine for the engine
> since replacing the switch on the lower left of the radiator, but doesn't
> work at all for the AC.
>
> I have to replace th receiver dryer and need to flush the system. What do
> you recommend to flush it with?
>
> John
>
> On Jul 22, 2016 13:42, "kenneth wilford (Van-Again)" <kenwilfy@comcast.net
> >
> wrote:
>
> Fan should come on low speed with or without pressure.
>
> Ken
>
> On Fri, Jul 22, 2016, 2:39 PM John Rodgers <jrodgers113@gmail.com> wrote:
>
> > The AC system has not been run for at least 15 years - the ten years it
> sat
> > in a garage and the 5 years I have had it. Will the high speed fan come
> on
> > if I DO THE FOLLOWING:
> >
> > (System empty or low on refrigerant))
> > Ignition ON ( but not start)
> > AC blower fan set to low
> > AC CONTROL set to cool
> >
> > Will the fan turn on? It does on my 88'
> >
> > Or do I have to raise system pressure to get the system to turn on? I
> know
> > when it gets sufficiently low it shuts itself off and will not run.
> >
> > Thanks ,
> >
> > John
> >
>