No subject

the condenser, along with the relief valve. One is a safety switch that will
cut-out the compressor. The other says "high pressure fan switch" which, I
presume, kicks in the radiator fan. The low-side probably has a thermostat
device which cycles the compressor based on evaporator surface temperature.
Try jumpering the high side switch and see if the system works (with the
compressor connected normally). This will tell you if it is overpressure
that is causing your problem (assuming the switch is o.k.).
Other things than overcharge will cause high pressure: Air in system, other
contaminants, Insufficient cooling of the condenser (dirty, fan not
working...). If the problems not high pressure cutout, then try jumping out
the low-side (evaporator) thermostat (don't ask me where the electrical
connector for this is. Maybe another lister can help). And see if maybe your
problem is there.
Did you ever think of investing in a set of A/C gages? The cheapies from
harbor freight or JC Whitney work ok. I got a r12/r134 combination set I
like a lot from www.ACkits.com.
Incidentally, once you do get it going, you may want to adjust that t-stat
(see the knowledge base).
HTH
Steve

-Original Message-----
From: Obin Olson [mailto:oolsen1 at ec.rr.com]

so now that I have the 35oz approx. and it is blowing cold am I going to
blow somthing up? or is it fine for now?

----- Original Message -----
From: "Stephen Santoliquido" <santoli9 at cox.net>

> http://www.airpartsonline.com/default.tpl gives capacaties for AC systems.
> 35oz is correct for r12. If you jump to a later year you find the r134
> systems used 25oz.
> hth
> steve
>
> -----Original Message-----
> From: quattro-admin at audifans.com [mailto:quattro-admin at audifans.com]On
> Behalf Of Obin Olson

> I am dying here! I have a 1988 quattro model 90 and have just replaced a
A/C
> hose on the system now I got it filled with 134a about 35oz worth and the
> compressor will not cycle on, I can jump te compressor with 12v and it
will
> come on and the A/C will blow cold but it will not cut in with the A/C
> switch, I have checked the A/C switch(took it apart) and it seems fine so
> what could this be??
>
> Dying from the heat in NC - Obin Olson
>
> thanks for the help
>
> also could this be the low pressure switch gone bad?? if so I can't find
> it!! I have the Bently and still I can't find the low side switch!
> help!