Another A/C POA question

[BamaC10's]

1970 C10. Sorry to post another POA and A/C question but I can't find my answer. I'm restoring my factory A/C system and keeping the R12. Flushed the system, new hoses, accumulator etc. My factory POA is testing good with the bypass around 29.5-30 psi but until it bypasses there is some air escaping around it, not much but some. Is this normal?

[Richard]

Think that would be normal operation. Flow of refrigerant should not completely stop at any time.

[BamaC10's]

Originally Posted by Richard

Think that would be normal operation. Flow of refrigerant should not completely stop at any time.

Thanks Richard. I felt that would be the case but also curious to how much is to much.

[BamaC10's]

I found a new CARQUEST model T58098 that I'm pretty sure is a 4seasons on eBay for a very decent price (accepted lower offer). Do these drop in and bolt up to factory brackets?

https://ebay.us/m/MYtA1E

[A1971Blazer]

Originally Posted by BamaC10's

I found a new CARQUEST model T58098 that I'm pretty sure is a 4seasons on eBay for a very decent price (accepted lower offer). Do these drop in and bolt up to factory brackets?

https://ebay.us/m/MYtA1E

That looks like a Pro6ten compressor. If it is, it's an upgrade from the factory A6 and it should bolt in place of the A6. The are much more expensive from VA and other sellers.
I'm also in the process of restoring the factory air on my '70 and looking at using one of them or a Sanden S7 .

[BamaC10's]

Originally Posted by A1971Blazer

That looks like a Pro6ten compressor. If it is, it's an upgrade from the factory A6 and it should bolt in place of the A6. The are much more expensive from VA and other sellers.
I'm also in the process of restoring the factory air on my '70 and looking at using one of them or a Sanden S7 .

I originally had plans of keeping my original A6 that seems to be in working condition but I've did a lot of work under the hood and didn't want to risk eventually slinging compressor oil everywhere. Found this one and pulled the plug, If your needing one, he accepted my offer for $225. He has 3 more and they're all new.

[BamaC10's]

I kept what I believe to be the original paint on firewall and inner fenders and put poppy's satin over it all. Trying to keep an close to original look with everything except the few performance parts. Engine has aluminum heads and intake but I painted everything to look original

[davischevy]

Does the original AC manifold bolt up to the rear of that compressor?

[BamaC10's]

Originally Posted by davischevy

Does the original AC manifold bolt up to the rear of that compressor?

I haven't received it yet, but my research says it will. Please advise if you know otherwise. Thanks

[A1971Blazer]

Originally Posted by BamaC10's

I haven't received it yet, but my research says it will. Please advise if you know otherwise. Thanks

Not sure how close you are to installing the compressor but please update on the fit. According to all the research and a call to Old Air tech, it should fit right into place of the A6, hoses and all.
Also, did you get the new hose assembly that mounts to the compressor, if so where?

[Jeff M.]

I installed a Four Seasons 58098 compressor on my 69. The factory manifold bolted up just fine. If my memory is correct, the bolts on the flange in the front were metric.

[BamaC10's]

Originally Posted by A1971Blazer

Not sure how close you are to installing the compressor but please update on the fit. According to all the research and a call to Old Air tech, it should fit right into place of the A6, hoses and all.
Also, did you get the new hose assembly that mounts to the compressor, if so where?

It's supposed to be here by Saturday. Hopefully I'll start mocking it up by next week. I believe it'll work but wouldn't be surprised if it didn't lol. If it does, I'll flush it of PAG and refill with mineral oil and paint it black. Advanced Auto/CARQUEST site shows it'll work for a 71 C10 but not for a 70? It only shows double slot pully's for a 70 model for some reason. That's probably why most of them are going out business around here.

My hose's have been on the shelf for over a year now. Go figure, a build taking longer than expected. I'm almost certain I got those and the accumulator from LMC. One thing I did just notice is that the muffler has and 134a port. Not a big deal since I have the adapters and no plans of selling but will probably tag it showing R12. I'm using original POA and Expansion valve, both have been cleaned and tested.

Correction: I got the muffler hose assembly for GMCPauls

[BamaC10's]

Originally Posted by Jeff M.

I installed a Four Seasons 58098 compressor on my 69. The factory manifold bolted up just fine. If my memory is correct, the bolts on the flange in the front were metric.

That's encouraging to know. I'll be sure to double check those bolts. I know the belt adjustment bolt is fine thread. Thanks!

[leddzepp]

Originally Posted by BamaC10's

I found a new CARQUEST model T58098 that I'm pretty sure is a 4seasons on eBay for a very decent price (accepted lower offer). Do these drop in and bolt up to factory brackets?

https://ebay.us/m/MYtA1E

Yes they bolt right up to the factory brackets and hoses. I’ve been using one for about 10 years now. You will get no oil sling from it, it won’t leak, and your belt won’t squeal either. Smart man keeping the r-12, I did the same thing. You won’t have any problems and will enjoy cold air in 100+ degree temps even sitting in traffic with no air flow to the condenser.

[BamaC10's]

Originally Posted by leddzepp

Yes they bolt right up to the factory brackets and hoses. I’ve been using one for about 10 years now. You will get no oil sling from it, it won’t leak, and your belt won’t squeal either. Smart man keeping the r-12, I did the same thing. You won’t have any problems and will enjoy cold air in 100+ degree temps even sitting in traffic with no air flow to the condenser.

I appreciate those encouraging words! I did a lot reading up and talked to a few people and everything suggested that I would have better odds of being cool in hot humid North Alabama summers with R12. That's based of keeping the original system of course. I guess as long as I can source it, I'll keep it that way.

[A1971Blazer]

Originally Posted by BamaC10's

It's supposed to be here by Saturday. Hopefully I'll start mocking it up by next week. I believe it'll work but wouldn't be surprised if it didn't lol. If it does, I'll flush it of PAG and refill with mineral oil and paint it black. Advanced Auto/CARQUEST site shows it'll work for a 71 C10 but not for a 70? It only shows double slot pully's for a 70 model for some reason. That's probably why most of them are going out business around here.

My hose's have been on the shelf for over a year now. Go figure, a build taking longer than expected. I'm almost certain I got those and the accumulator from LMC. One thing I did just notice is that the muffler has and 134a port. Not a big deal since I have the adapters and no plans of selling but will probably tag it showing R12. I'm using original POA and Expansion valve, both have been cleaned and tested.

Correction: I got the muffler hose assembly for GMCPauls

Thanks!
I've looked at the factory replacement parts at LMC and Old Air.
The prices are comparable and Old Air offers the hose and muffler assembly with either the r-12 or r-134a fittings, but as you said, no concern as long as you know.
I'm also tossing around the idea of a serpentine system with a Sanden compressor. In that case I would just make my own hoses.
Too many decisions!
looking forward to your outcome....good luck!

[BamaC10's]

Originally Posted by A1971Blazer

Thanks!
I've looked at the factory replacement parts at LMC and Old Air.
The prices are comparable and Old Air offers the hose and muffler assembly with either the r-12 or r-134a fittings, but as you said, no concern as long as you know.
I'm also tossing around the idea of a serpentine system with a Sanden compressor. In that case I would just make my own hoses.
Too many decisions!
looking forward to your outcome....good luck!

I'm not gonna lie. The 134a fitting on the muffler is reeking havoc on my OCD lol. If you decide to go that route let me know and maybe I can sell you this one.

[BamaC10's]

The compressor arrived early. It was well packaged and in the original box, with all new bolts (which seem to be metric), orings etc. Brand new and never opened. I haven't mocked it up yet but side by side and pulling a couple measurements, I see no problem at all. Very pleased! What a great buy! I'm sure something is lurking around to corner to consume any money I saved! I think the seller still has a couple if anyone is looking.

https://ebay.us/m/MYtA1E

[Jeff M.]

Good deal! I painted mine semigloss black and not many people realize it's not factory.

[BamaC10's]

Originally Posted by Jeff M.

Good deal! I painted mine semigloss black and not many people realize it's not factory.

That's my plan, I'm prepping it now for paint.

It came with 3 oz pag. I need to drain and refill with mineral. Do these take the same amount as original A6?

I should add the compressor info doesn't specify amount just that it came with 3oz pag

[Jeff M.]

I just flushed the new compressor and only added about 1 1/2-2oz of mineral oil. The front seal on the old compressor had just begun to fail and a partial charge was still in the system. I slowly released the pressure and didn't lose much oil. It's been working fine for 2 years now.

[BamaC10's]

Originally Posted by Jeff M.

I just flushed the new compressor and only added about 1 1/2-2oz of mineral oil. The front seal on the old compressor had just begun to fail and a partial charge was still in the system. I slowly released the pressure and didn't lose much oil. It's been working fine for 2 years now.

So did you flush with mineral oil or ac solvent?

I watched a video of a Pro6TEN disassembly and I don't see how you could get all that pag out there. I'm guessing a little left over want hurt?

[BamaC10's]

A1971Blazer It just dawned on me your the one I got the temp sensors from! lol It's working great by the way. Thanks!

[Jeff M.]

I flushed with a/c solvent.

[BamaC10's]

Ok. I've got the new compressor draining out the back because nothing I have will fit onto the side drain plug. Is there a special tool needed? Pro6TEN or Four Seasons 58098

Also, the rest of the system is clean and flushed or new. Once I attempt to remove all the PAG from the compressor should I go with Ester to be safe or get all I can out and use mineral oil?