Date:         Wed, 16 Aug 2000 02:43:49 -0400
Reply-To:     John <johnpatt@warwick.net>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         John <johnpatt@warwick.net>
Organization: PattonSystems International
Subject:      Re: 89 syncro westy ac question
Comments: To: Mick Kalber <hotlava@interpac.net>
Content-Type: text/plain; charset=us-ascii

Mick Kalber wrote:
>
> So, Mark Dorm got me thinking yesterday... perhaps the freon that was in the
> system when I took it in for repair (there was about 2 12 pounds) was bad.
> It was God knows how old.  Can freon go bad over time,

>   Whadayathinkabouthat?
>
> Mick Kalber


Mick,

R12 does not "go bad" like beer going flat or clothing going out of
style! It seems your tech does not understand how the principles of
evaporation & condensation "move heat". The compressor should exert
pressure on the high side (condensate zone)while drawing on the low side
(evaporative zone). During the "change of state" the evaporating
refrigerant absorbs massive amounts of heat.

The compressor provides the labor for the high side pressure and low
side pressure drop with the expansion valve acting as a referee to
manage the "change of state"! The closer the high and low side pressures
are to each other, the LESS efficient the process is. Typically a normal
High side is 185-205 psi and the low side is 15-30 psi. Either your NEW
compressor isn't working (NO LABOR), the NEW expansion valve isn't
working (NO REFEREE) or you have a foreign agent like dirt, moisture or
PAG oil in your R12 system negating the necessary valving action. Your
high & low side pressures are too close and the system is grossly
overcharged to overcome the non-functional part or the effect of the
foreign agent. I think you need a new technician........if you'll pay my
expenses, I'll come out and fix the system to function correctly!

Regards,     John