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Best compressor and refrig for an older car

dwg on Wed June 24, 2009 9:37 PM User is offline

Year: 1967
Make: Chevy
Model: Impala
Engine Size: 283
Refrigerant Type: ??

I am Restoring this car, It is a driver, not a show car, I want it to be original, but if there is a compelling reason to change the compressor and refrigerant, I will.

My old A-6 compressor is a ball of rust.

One shop recommends a sandeen conversion kit, R-134, and adding a switch to cycle the compressor.
advantage: cheaper, quieter, works better, much less horse power to run, says A-6 is 10-15 HP drain.


another shop recommends a new A-6, stay with R-12 and use the POA valve, with no cycling switch.
advantage: more reliable, simpler, works better, r-134 corrodes evaporators,


Is one right and the other wrong, or is this something that A./C professionals just can't agree on?

TRB on Wed June 24, 2009 11:41 PM User is offlineView users profile

New aluminum body A6 with R12 is what I would suggest. We can hook you up with the compressor as we have sold a few already with no complaints.

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Edited: Wed June 24, 2009 at 11:41 PM by TRB

bohica2xo on Thu June 25, 2009 4:30 AM User is offline

Quote
Originally posted by: dwg


One shop recommends a sandeen conversion kit, R-134, and adding a switch to cycle the compressor.

advantage: cheaper, quieter, works better, much less horse power to run, says A-6 is 10-15 HP drain.

Cheaper - maybe.

Quieter? Nope. Clutch clacks on & off to control cooling. Compressor runs wide open or dead stop.

Works better? Nope. OEM system uses continous control of evaporator pressure to prevent freezing, and deliver constant air temperature to the cabin.

Less horsepower? Nope. Not for the same volume pumped. 20 CFM @ 250 psi takes the same work to produce - they are both axial piston pumps. 15HP? LMAO Belt life would be measured in weeks if that was true.

There is nothing new or wonderful about CCOT systems. They are just cheap to make. When that car was built the A/C option was probably $900.00 or more. Now A/C comes in all of the econoboxes as standard equipment. Back then you got a system designed for optimum performance at a premium price.



Quote
another shop recommends a new A-6, stay with R-12 and use the POA valve, with no cycling switch.

advantage: more reliable, simpler, works better, r-134 corrodes evaporators,

Is one right and the other wrong, or is this something that A./C professionals just can't agree on?

Most of that is right. 134a is not exactly battery acid, but a proper flush must be done for a conversion. The bigger issue with 134a is the need for a better condensor. This means a custom installation on your Impala, including custom hoses. Or you could just stay with R12...

Stay with R12, the POA & some sort of A6. Tim's new aluminum A6, or an iron A6. I think the aluminum one may be the way to go.

B.



-------------------------
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

dwg on Fri June 26, 2009 8:12 PM User is offline

TRB

Is there any special advantage to the aluminum A-6? Is it much lighter, maybe prettier?

Does it have all the exact same mounting points as the old steel one? So it can bolt right in?

Any reason Not to use the old black steel style? My engine is not dressed up, so that's not an issue.


Why do you recommend staying with the R-12? Is it true that it will work better, and the R-134 can be corrosive?


Thanks

dwg on Fri June 26, 2009 8:28 PM User is offline

Bohica

Assuming I stay with r12, is my original style condenser adequate?

The one I have right now looks very corroded on the outside, so even if it could be flushed and pressure tested, I believe I want to change it anyway. Is this a part that should be upgraded, or is the OEM style fine as long as nothing else changed in the system?

Hoses are not an issue one way or the other, I need all new anyway. Is there any harm in using the barrier hose, is it compatible with R12 and the old lubricant?

Thanks

TRB on Fri June 26, 2009 9:10 PM User is offlineView users profile



-------------------------

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Contact: ACKits.com

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