keith
From the date on this, its been floating around the internet maze for a couple
weeks. My info may be too late, but here is what I did to convert my 72. BTW - I
read the chassis service manual & instruction that came with the A/C gauges and it was
enuff edumacation to get thru.
It was all apart already. I blew out the evaporator & condensor & hoses with a
"special A/C" cleaner I got from the parts store. Changed all o-rings to green
type. Drained oil from compressor. New dryer. Added 134 type oil (Pag/ester????) to
the compressor. My chassis service manual listed the amount, I can get the amount if
you need it. Leak checked system. Added 80% (by volume) charge of the 134. Works
great ( 42-44 degree air at vents). I used the stock POA and expansion valve.
I've read of a replacement ($75-$90) for the POA valve which converts the system to a
cycling system (engages/disengages) the A/C compressor clutch. Go to www.google.com
and do a search for "POA valve update/upgrade" you will find several sites that
explain how it works. I'm keeping the old POA though cause its working fine.
rick
I con
---------- "Keith Cooper" <[EMAIL PROTECTED]> writes:
The car is a 71 Chevelle with the stock A/C system.
I thought that the 71's used a expansion valve setup and did not have the accumilator.
I was wanting to do the work myself to save money. I found a vacuum down unit that
uses the air compressor. It sells for under $16.00. All I would need is to replace all
the o-rings,the vacuum down unit, oil and freon. I just do not know if the expansion
valve has to be replaced with something else if I change to R134. I had a friend that
changed his 1991 IROC from R12 to R134 and it worked good. If I change to R134, I can
refill it myself if needed. I want to learn how to change the system. I just need
knowledge about how. I also need to know how much oil you have to add to a R134
system. I think that a 71 compressor uses about 3# of freon.
Keith Cooper
See my Chevelle:
http://home.mindspring.com/~keithc/index.html
rick schaefer
72 El camino
http://members.home.net/jimmy4/rick1972elky.html
ACES #00140
Team Chevelle #00038
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