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

["Brian Wagner" <scirocco_88_16v@hotmail.com>]

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

87 16v
86 8v (parts car)



>From: T Berk <tberk@mindspring.com>
>Reply-To: tberk@mindspring.com
>To: curtv@eudoramail.com
>CC: scirocco-l@scirocco.org
>Subject: Re: Help! R134 is the pits (hope you're not too sick of this 
>topic!)
>Date: Wed, 03 Oct 2001 16:03:26 -0700
>
>
>Re using the new A/C stuff in your old system-
>
>Perhaps you might want to maximize the heat transfer by cleaning the
>front (what is it called, and the Condenser? Evaporator?) in front of
>the rad.
>
>You might also consider installing one of those brushless muffin fans
>that run on 12v, you can get them for $5-10US, mounted on the front to
>PUSH air in and hooked to trigger (prob w/ inline fuse and and a diode
>wouldn't hurt to prevent backwash),  these thing are built for computer
>cases but serve in other respects. I'd think a great big 3" or larger
>would be in order.
>
>Other than that I wonder if you have the big square compressor or the
>later round type, I believe the early kind was not as efficient and put
>quite a load on the motor.
>
>hth,
>TBerk
>
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