RE: Help! R134 is the pits (hope you're not too sick of this topic!)

["Gerry Reichelt" <greichelt@mmcable.com>]

Well said. Another reason for drawing a vacuum is that it also checks for
leaks. Only thing is, you have to have gauges for 134a (different fittings)
or you can't check your pressures.

Gerry Reichelt

-----Original Message-----
From: owner-scirocco-l@scirocco.org
[mailto:owner-scirocco-l@scirocco.org]On Behalf Of Brian Wagner
Sent: Thursday, October 04, 2001 8:31 AM
To: tberk@mindspring.com; curtv@eudoramail.com
Cc: scirocco-l@scirocco.org
Subject: Re: Help! R134 is the pits (hope you're not too sick of this
topic!)


Alright I have been watching this topic long enough now it is time for my
.02.

The r134a conversion when done right cools just a effectively as the old
r12.

1)Items that should be replaced when doing this to ensure total efficiency
are the receiver/dryer, expansion valve and new oring seals at all the
joints. Also you should flush the condensor (in front of the radiator)and
the evaporator (in the air exchager in the car), this removes the r12
mineral oil based lubricant (does not mix with new synthetic PAG oil) if
mixed it will eventually gel and plug up everything. After the system has
been flushed install the receiver/dryer and expansion valve, imediately draw
a vacuum on the system if not the receiver/dryer will become saturated (it
is a desicant, removes moisture from the system). At this point you will
then add 8 fluid ounces of pag oil and 34 to 36 oz. of r134a (yes this is
10% to 15% less than the r12 factory recommendation) this due to the
different expansion rates of the gases under pressure. Low side pressure
underload of the compressor should flucuate between 35 and 60 psi, highside
between 170 to 220psi. When all this is done you will blow very cold air, I
did this to my wifes car and with the outside air temp of 98f the vents were
blowing 59f almost 40 degrees different and thats in Texas.

the parts needed were cheap
receiver/dryer - $18 German Auto Parts
expansion valve  $31 same
oring kit - $7 local supplier
r12 to r134a conversion kit - $29 at kmart (or store of your choice) this
includes pag oil, r134a, fill hose and r134a adapters

You can do the whole system in 1 to 2 hours based on skill, and do all the
work yourself. Except maybe the vacuum, take it to your local garage and
they can do that for like $20. When r12 is currently going for $60 to $70
per 12oz's this conversion is much more cost effective.

Don't be such wussies and get it done.

Brian



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