got A ??? if i replace my AC with all original parts what would i need to do or add to make it use r134a freon

I'm not real sure but 3yrs ago I took my wifes 79 cutlas and installed r134 in it. The kit I used came from advanced auto parts. All that I recall doing was install new O rings (green in color}that came with the kit, put in a new expansion valve,and I believe I changed the drier.Never have had any problems with it yet!

I'm not sure about the old P.O.A. valve systems but, normally you change the reciever/dryer, drain out as much of the R-12 refrigerant oil as possible, and change the oriface tube filter (or expansion valve if needed). Then you add PAG or mineral oils and R-134A as needed. I would imagine the same procedure would be used on the POA valve system also.

You might want to try this

www.id-usa.com (http://www.id-usa.com)
This is the kit I used (retro kit)

I'm not to this point yet in my resto but will be next summer. Browsing through the Year One catalog, I noted that their POA replacement parts specify that they are for R-12 use only. Implies caution in conversion.
Hopefully someone will post who has done it with the older systems.

On another note, I did a conversion last summer on my wife's car. DO NOT USE the kits. Their adapters are really cheap and prone to failure. Their guages and hoses are ok. Ask your parts guy to get out the good stuff and for a few dollars more you can get nice brass adapters.

In my case, on the '70 Malibu I have a later model condensor and evaporator (80's) I'm gonna retrofit into the case and use an orifice tube filter if all goes well.

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"Laissez Le Bon Temp Rouler' Cha!"

"Jungle"Jim
Team Chevelle #105
70SS396 & 70 Malibu
"I don't drive FAST, I just FLY low!"

ron
I have a 72 that I converted just over a year ago. Its been fine so far. At that time,
1- I removed compressor & drained old oil.
2- Flushed evaporater & condensor to remove residual oil.
3- Replaced dryer
4- Replaced expansion valve & POA (from year one) just cause they were 25+ years old.
5- Replace all o-rings with green ones.
6- Flushed lines.
7- Added some (8 ounces???? maybe) of 134 oil to the compressor.
8- Had it pressure/vacumn checked & serviced.

As I said, its cooled fine - output air on 95+ days was about 44 degrees. Maybe not optimum but good enuff to keep me cool.

The other day, I noticed a slight oil leak at the front of the compresser. Possibly time for new one. But I don't think that this was caused by the 134. The compresser is a "lifetime warrantee" rebuild that is about 5 years old. When I replace it, I will probably go with a NEW AC Delco unit. Someone here said that the new ones are MUCH better than rebuilds & worth the cost.

My experience.

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Rick
72 El Camino (http://members.home.net/jimmy4/rick1972elky.html)
TPI350/700r4
TC#00038
ACES#00140