a/c r134-r12

[Sandy]

I think hoses may also be a problem with 134a, as I was sitting in Jippy
lube I was reading the motor magazine and they seem to say that the smaller
molecule size of 134 will have problems with leaks in older system since
the hoses themselves are not designed for it. Also, them mentioned that a
high pressure safety switch should be used inseted of the high pressure
release. 

Sandy

At 08:26 AM 7/4/98 -0400, you wrote:
>How much OTHER stuff needs to be changed to run 134a?   I heard the oils
>are not compatible,  and the 12 oil will contaminate the 134.   If this is
>so,,, how do you get ALL the old oil out??
>
>					Scott...
>
>P.S.  I know this is off-topic,,, could you please e-mail to me directly?
>			Thanks,   SSchaaf at ERINet.com..
>
>----------
>> From: mrvette <mrvette at bellsouth.net>
>> To: diy_efi at efi332.eng.ohio-state.edu
>> Subject: Re: a/c r134-r12
>> Date: Saturday, July 04, 1998 9:55 AM
>> 
>> > > Op-Amp --> 555 timer)
>> > >
>> > Mat,
>> > since I had a sleepless night (a dumb a** put R134 into my R12 a/c
>> > and did at least $800 worth of damage..) I have been working on a 555
>> > circuit.
>> 
>> the adding of r134 nto an r12 system should not, in and of itself cause
>any
>> damage,  it just wont work very well,  unless it is run like that and the
>r134
>> will not pick up the ref. oil to oil the compresser...that is the only
>way it
>> could happen to cause the compresser to self destruct internally....can't
>> imagine anyone running the system that long...
>> 
>> Oh well, wonder how that happened?  fellow doing the work used a set of
>homemade
>> adapters?  otherwise the fittings on hoses wouldn't fit....
>> 
>> changeovers are easy to do BTW...GENE
>