AC POA Valve Update

[mechanicalman]

Originally Posted by Andy4639

Well my luck with the old A-6 compressor's was not worth the time to even borther with it. Get a aftermarket compressor and be done. I bought 4 that's right 4 A-6 compressor over about a 10 year peroid and didn't last more than 2 years on any of them. They were all 134-A suposedly to! I went over a year without ac.
Aftermarket compressor with cycling has been on the truck now for 3 years and no problems and haven't charged it since the install.

Sanden: Smaller, lighter, more efficient and much more durable. Win-win.

[brown7373]

I bought a Haynes A/C Manual and learned to do my own A/C work, to avoid constant trips to the A/C shop. My 72 Cheyenne has the same A6 compressor as when I bought it in 2003. I had the POA adjusted for 134a, new dryer and expansion valve and my A/C has worked fine in south Florida for over 10 years. My 1972 Cutlass, same set-up but also with a cross flow condenser pumps out 30 degree air from the vents. Also, same A6 compressor as when I bought it in 2006, and it hadn't been replaced in the 4 years the previous owner had the car.

I have a 1970 Bonneville that I am rebuilding. Classic Auto Air in Tampa suggested I get a rebuilt A6 right before I install it. The seals have a tendency to leak if they sit on the car or on the shelf and not used. Even a brand new seal can go bad and leak if the system is not charged and used.

[mechanicalman]

Originally Posted by brown7373

I bought a Haynes A/C Manual and learned to do my own A/C work, to avoid constant trips to the A/C shop. My 72 Cheyenne has the same A6 compressor as when I bought it in 2003. I had the POA adjusted for 134a, new dryer and expansion valve and my A/C has worked fine in south Florida for over 10 years. My 1972 Cutlass, same set-up but also with a cross flow condenser pumps out 30 degree air from the vents. Also, same A6 compressor as when I bought it in 2006, and it hadn't been replaced in the 4 years the previous owner had the car.

I have a 1970 Bonneville that I am rebuilding. Classic Auto Air in Tampa suggested I get a rebuilt A6 right before I install it. The seals have a tendency to leak if they sit on the car or on the shelf and not used. Even a brand new seal can go bad and leak if the system is not charged and used.

30 degree air in South Florida? Did you mean 40 degree? Maybe a bad thermometer?

A6 compressor is big enough to cool a small house and it's the only compressor I've ever seen with it's own oil pan and oil pump. Some shoddy re-builders have given others the impression that they are not good, but really they are very good.

I just think their day has came and went, too big and too heavy with a small clutch diameter that makes for a weak clutch that does not hold up well on a cycling system.

I have a question for you that I've tried to research to no avail. Is there a different expansion valve for 134A?

[Bigdav160]

Is there a different expansion valve for 134A?

Not that I know of. A properly R134a adjusted POA will keep the evaporator core cold

[MARKDTN]

Not sure who says an A6 can't be used cycling. I had a '77 and a '79 Pontiac Bonneville with A6 compressors and pretty sure both had cycling systems. The '77 had almost 300,000 miles on the original compressor. Ford also used them. We had a '79 LTD that had an A6. I don't know if it was cycling or not.

I have installed a few of these kits with no big issues. Put on a '71 C10 and a '67 Firebird. Both still going fine as far as I know.