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AC system size

1424 Views 13 Replies 4 Participants Last post by  69307/350Chevelle
I have a '69 chevelle, going to vacuum test the system, I heard you should make sure you know the correct system size so you don't overcharge it, how can I find this information? Also, I'm sure I need about 36oz of esther oil total? I know some needs to go into the compressor, any other specific areas that I should put the oil in to get it started?
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Hah ok, wow good thing I asked about how much oil ;) . The system is currently all stock with the exception of the POA replacement, even has the old compressor and is completely empty. I figured I'd have to put some in the compressor to lubricate it. Then just spread the others 11oz out by putting it in other places? or just put it all in thru compressor, thanks!
That is assuming the system is dry and empty (been flushed and blown out).

5 ounces in the compressor sump, you fill it through the hole on the bottom of the compressor. 3-4 ounces in the evaporator, some in the R/D and the rest in the condenser.

You really might want to reconsider that POA eliminator. The POA valve is the heart of that system and new/good used ones are easy to find.
Take a look at the FAQ section at There are articles on testing and calibrating the POA. It's easy to do.
Concderns about the clutch really aren't the issue with the POA eliminator. They just don't work as well as the POA. It's really a downgrade to the system.

I've heard that cycling was hard on the A-6 clutch and used to think it was accurate. However, looking back, many early GM CCOT systems used the A-6 with no difference in the clutch. I recently bought a 78 ElCamino that has an A-6 cycling system.

You can get the conversion stickers at most any parts store.
Heh so I got cold air for about 3 min, then the jump tube (metal line from condensor to drier) decided to blow a hole in itself. Guess it wasn't still good after all those years. Can I just get a metal line with the same threads, or do I need something specifically for that replacement?

You could replace it with generic metal tube, but I doubt you could find it with the correct fittings on the ends. That tube is available.

You did replace the dryer and check the screen in the TXV, didn't you? If the system was empty for a long time, it's likely full of corrosion
I did replace the dryer, and did replace the TXV, so I hope there isn't any corrosion in it :) . Yeah just went to local parts place, they have metal lines, but not with the threaded fittings on the end. Perhaps later I might try Home Depot or even...*gasp* Autozone...
You won't find the correct line at any hardware store and not likely at a parts store.
Here's the line you need, second from the bottom of the page:
double post
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