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OK...need some old school auto A/C help daytona° 08-12-2007
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Posted by daytona° on August 12, 2007, 11:32 pm
I have a buddy (new no doubt) since I do A/C and Refrig. And his question
was can I get his Classic car A/C going. He sent me these pictures. And in
45 yr, I have not seen an apparatus like this on a GM A/C unit.
Here is the site I put the pics up on: http://jlbco.hypermart.net/59ac.htm
Thanks
JB



Posted by IRONDOG on August 13, 2007, 1:04 am

daytona° wrote:
> I have a buddy (new no doubt) since I do A/C and Refrig. And his question
> was can I get his Classic car A/C going. He sent me these pictures. And in
> 45 yr, I have not seen an apparatus like this on a GM A/C unit.
> Here is the site I put the pics up on: http://jlbco.hypermart.net/59ac.htm
> Thanks
> JB
>
>
That's a 1958 Chevy 348 Tri-Power and you need this book...
http://cgi.ebay.com/ebaymotors/1958-Chevy-Air-Conditioning-System-Service-Booklet_W0QQitemZ290148696529QQcmdZViewItem
You're welcome.
Jerry

Posted by lp13-30 on August 13, 2007, 8:42 am
The part I assume you are referring to is a hot gas bypass valve. It is
there to prevent the evap from freezing up. It also has some adjustment
there so the evap temp can be raised slightly when max cooling capacity
is not needed. Larry


Posted by U-Hate-Me on August 13, 2007, 12:07 pm

> The part I assume you are referring to is a hot gas bypass valve. It is
> there to prevent the evap from freezing up.

This application has always baffled me. Why go to the bother of installing a
hot gas
by-pass and all the crap that goes with it, when a simple low ambient would
seem
capable of doing the job.

I say this after just working on a McQuay unit with repeated nuisance
resets.



Posted by lp13-30 on August 13, 2007, 12:22 pm
Years ago, GM did not want their compressors cycled off and on for
temperature control. Funny though, their dealer installed under dash
units, called "CoolPack", did exactly that and AFAIK used the same
compressors. They used hot gas bypass until 1962 when they switched to
suction throttling valve (basically an EPR-- their terminology, not
mine). In 1965 they switched to POA valve which did about the same
function. Somewhere around 1974 they went to a VIR (valve in reciever)
system. I think they switched all their system to orifice tube and
cycling clutch in 1977, though they first came out on 1973 p/u's and
Vegas. FWIW, the hot gas bypass line tied ino the outlet of the evap
right at the txv bulb, rather than just dumping hot gas back into the
compressor. I still have my book from auto a/c
class in 1972, though some of it is not in the best of condition. If the
OP wants any info, I will be glad to make some copies and mail them. I
have no way to scan/Email them tho. Larry


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