A/C related questions

[71CHEVYSHORTBED402]

71 C-10 402........................I know, a lot of questions. My former co-workers loved it...........


1. Has anyone seen a reproduction for the compressor decal pictured below? There are similar on-line, but they don't read the same. This is a nice original decal, but the compressor should be rebuilt. It's not cost effective to send out when you can buy a rebuild for $200, paint and throw on a new label. Word is you can remove it "very carefully". I may test that theory out, but I can't imagine a great success rate. A heat gun might be the ticket.

2. Speak of these decals, why the variance in charge rates? For whatever it's worth, I hear GM used the same "A6" compressor from something like 1961-1972, and perhaps beyond. Maybe it's a variance of evaporators, condensers, and/or cooling areas.

3. The POA valve must be calibrated for R12 Vs R134A. This sounds like something that occurs when the system is charged as opposed a modification. Can anyone confirm?

4. I read where a condenser fan is recommended for R134A. Is this for cooling purposes and/or for longevity of the parts? Personally, I won't use the A/C much either way.

5. Are there aftermarket hose lines like originals or should you just restore the old rubber to maintain the look?


During my A/C homework and if it's any value, this is what I understand so far using the "original" system for R12 Vs R134.........Any additions and corrections appreciated.

A. Replace all O-rings for R134A compliance. These operate with R12 as well.

B. Does an original R12 Evaporator work with R134A? Just curious, I need to replace the Evap. either way.

C. Replace the drier for R134A compliance. The drier will work with R12 as well.

D. Calibration of the POA valve differs for R12 vs R134A. You can modify the system to run without the valve.

E. One A/C guy says the original condenser will run using R134A, while another A/C guy says the components for R134A allow for R12, but not the other way around. I'm replacing the condenser anyway. Unless you're a straight-up purest or happen to have one that's mint, I don't see an upside using an original condenser, despite the "original" truck restoration.

F. For what it's worth, one of the A/C guys, who's been in the business 45 years says a Vintage Air conversion adds value as compared to original or an "original" conversion to R134A. He "blames" the younger crowd. Personally I'll run an "original" conversion. Having the brackets, the cost for a restored system appears some hundred less, even with someone else restoring the boxes.

G. Sure a lot of variance in the cost for a rebuilt compressor and replacement parts. The cheapest is 45 year experience dude, and he's half the cost the most expensive. Nice personable guy too. Doesn't strike me as someone who sells trash.

H. Replacement condensers and driers bolt on as original. At least per my research anyway. Not sure about evaporators, but I imagine they do.


Appreciate it.......Thanks