Date: Sat, 23 Jul 2016 10:53:37 -0500
Reply-To: John Rodgers <jrodgers113@GMAIL.COM>
Sender: Vanagon Mailing List <email@example.com>
From: John Rodgers <jrodgers113@GMAIL.COM>
Subject: Re: AC - Again! '91 Carat
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Given this thing has never been converted to 134a, has to have a new
receiver/dryer, and needs flushing, I think I will take it to an A/C shop
and let them deal with it. As you suggest, it may a need a new compressor,
too. Having to break the system open and also it having not run in so long,
it will also be time for new seals through out. Might as well get it all
done in one fell swoop!
On Jul 23, 2016 09:12, "Dennis Haynes" <firstname.lastname@example.org> wrote:
> Go t Amazon and search AC Flush. There are a number of kits (tools) and
> solvents available some priced as low as ~$40/gallon. You also need to
> consider the lubricant in the compressor. After all this time of non-use it
> probably should be replaced. When the parts inside break and get throughout
> the system things become a mess. The condenser needs to be checked out as
> they often corrode on the inside and may be plugged up which will make for
> very high pressures and poor performance.
> As for the cooling fan there are often minor variations on operation. This
> AC was an add on. For the most part, the radiator fan should turn on it
> lowest speed with the compressor. A variation I see here is sometimes the
> compressor has to actually be activated. Other times, it just has to be
> called for. In other words, if the system wants to turn the compressor on
> but can’t due to the low pressure cut out the radiator fan will still run.
> Either way the power for the radiator fan is coming from a relay in the AC
> system through the .27 ohm cooling fan resistor.
> As the AC is operating the if the AC high side pressure goes above ~200
> psi the high pressure switch looks to speed up the radiator fan. This is
> done by energizing relay #5 on the front fuse box. This relay was the high
> speed relay for the non-AC radiator fans and earlier vans. This switches
> power to the .09 ohm resistor speeding the fan up significantly. If the
> high side pressure continues to climb at some point it will lock out the
> compressor. For the radiator switch when it calls for high speed it uses
> that large relay above the fuse box with has its own wire from the battery
> to make that fan go as fast as possible.
> -----Original Message-----
> From: Vanagon Mailing List [mailto:email@example.com] On Behalf
> Of John Rodgers
> Sent: Friday, July 22, 2016 5:57 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Re: AC - Again! '91 Carat
> I have read or heard somewhere, youtube maybe, of using the solution that
> is used to clean truck brake lines. Never seen it done, but was wondering.
> I think its basically alcohol. Put it in, blow thru with air. Air wold dry
> ot the alcohol. But not having done this before, I'm loath to get away from
> standard practice. But will if I understand the possible consequences!
> On Jul 22, 2016 14:48, "kenneth wilford (Van-Again)" <firstname.lastname@example.org
> > 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 <email@example.com>
> >> 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)" <
> >> firstname.lastname@example.org>
> >> wrote:
> >> Fan should come on low speed with or without pressure.
> >> Ken
> >> On Fri, Jul 22, 2016, 2:39 PM John Rodgers <email@example.com>
> >> > 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
> >> >