Questions on Replacing Entire A/C System. - Page 3 - Ford Bronco Forum
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post #41 of 58 (permalink) Old 04-15-2019, 12:10 AM
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Originally Posted by helirich View Post
That's pretty much what you do. Although you should pressure check with nitro before all that. I've never seen a sight glass on autos. So you can't fill by that. There is no 4th hose. The EPA allows some venting to the atmosphere for purging lines and such.
Thank you. It's good to know .They were talking about the changes coming, but I got into a different line of work before they took effect.

As for a sight glass on autos, I've seen some, but those were on cars from the 60s. I suppose they were dropped to save a buck, since for manufacturing purposes they probably weigh in the charge.

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post #42 of 58 (permalink) Old 04-15-2019, 11:29 AM Thread Starter
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No idea on why it pulled the oil out. I didn't even figure it'd be an issue I'd have to consider, since it should only be pulling air out.
All of the components except for the condenser are new, and I had that fully flushed and cleaned.

All of the write-ups and instructional videos said to measure and put the oil in before you seal the system. Pour a few ounces into the compressor, a few into the condensor, and a few into the dryer, and then seal it. I read this over and over.

Either way, at this point, I have no clue how much oil is in it, and I don't want to burn up my compressor. I also don't have the equipment to clean and flush it myself to start over.


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post #43 of 58 (permalink) Old 04-15-2019, 05:30 PM Thread Starter
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Wow, well it looks like I'm back to doing this myself. One shop didn't want to mess with any system that used to be R12, and the other wanted about $500 to diagnose and charge it.

I can buy a lot of equipment for that.

So, I'm still moving forward with it but am unsure of what to do.
Again, I have no idea how much PAG oil is still in the system, nor do I know how to find out.

What should I do?


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post #44 of 58 (permalink) Old 04-15-2019, 06:15 PM
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well...i'm not sure exactly what to tell you about the oil...short of pulling it and draining it again. that would suck to do but would tell you what is in what.

for the valves - if you were to buy a conversion kit you'd get these. they screw over the r12 valves and let you use the r134 connectors.



https://www.amazon.com/Wadoy-Convers.../dp/B07GZNP66G
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post #45 of 58 (permalink) Old 04-15-2019, 07:14 PM Thread Starter
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Thanks dash_cam, that's exactly what I ended up getting and it worked great for connecting the gauges to.

I stopped by a radiator shop and they said that yes, a system that is filled with air will vacuum and carry out the oil with it.
The only way to know for sure is to either

A: measure how much was vacuumed out (not an option for me) or
B: vacuum and fill with air over and over until no more oil comes out, to evac the whole system, and start over.

So, applying vacuum until it's empty might be a way to go.
But let's say I do that, and completely vacuum the system to empty, and then suck all the air out. As for putting oil back in, how is that done? The Freon is compressed and can be connected by a hose. But the oil is just in a pour can. How would the oil be added?


Lastly, this particular shop quoted me $99 for an "Evac and Recharge" plus the cost of Freon and oil, which isn't a bad deal at all.


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post #46 of 58 (permalink) Old 04-15-2019, 11:36 PM
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Let's put it this way. You have a sealed tank with a cup of oil in the bottom. If you hook a vacuum to a tube that is in the oil, it will suck the oil. If you hook the vacuum to the top of the tank, it will not. Oil doesn't boil off like water. (At least not in the vacuum our pumps can generate)

So if you sucked oil, it had to be sucking at the wrong location. (Or there was too much oil) Again, I'm not an auto tech, but I would say you should vacuum from the suction side (low side) first. The pump has one way valves, so oil should not come from there. So then it would have to go the whole system to get to the low side port. (Not likely) then after the vacuum is established, you could open the high side to get the last out. That way you don't have a lot of air passing through the oil.

In any case, to your question on how to get the oil in. If you have it vacuumed out (on both ports), close and unhook the high side. Rig a small tube to that port. Fill that tube with oil and let it suck in. This is alittle tricky as you will need a valve right at the port so you can shut it before air starts going in. I have several valves that can be put on either end of gauge hoses. But you probably won't have them. (I bought them for refrigeration work)

How does that shop say they will introduce the oil?
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post #47 of 58 (permalink) Old 04-15-2019, 11:45 PM
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You said your gauge set was leaking. I wonder if air was being let in on one side while vacuum was being pulled from the other. Allowing air to flow thru & draw oil out, instead of a steady vacuum with no flow passing thru.

The same thought might apply to removing more oil. If one side was left open & the other under vacuum it seems like the flow might pull the oil out.

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post #48 of 58 (permalink) Old 04-16-2019, 07:56 AM
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Quote:
Originally Posted by AbandonedBronco View Post
The Freon is compressed and can be connected by a hose. But the oil is just in a pour can. How would the oil be added?
For the old R12 systems, they used to have small cans of oil charge which were under pressure that you could add in when topping off your system, used mostly (I would suppose) if your system had a small leak. I don't know how much they held, but it was just insurance against not having enough oil in the system because of the leaks. I think the only downside of having too much oil is you can't put as much refrigerant in the system since it takes up some of the space.

Just a quick search, but here's one for 134a.
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post #49 of 58 (permalink) Old 04-16-2019, 10:51 AM Thread Starter
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Thank you very much for the responses.

El Kabong, I think you might be right. The leak in the gauge set made for a continuous passage of airflow, which continued to carry the oil through. Instead of just sucking the air out, it created an airflow that was left on for nearly an hour.

Helrich, I didn't ask how they'd put the oil back in, but I would imagine an automotive A/C shop has tools that I don't.
Possibly something like this?

https://www.amazon.com/Ketofa-Inject...V15AX9ZN5WFJ1N

SRWillis, that's what I've heard on having too much oil, too. Your A/C just won't be as cold since there's less room for the actual refrigerant.


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post #50 of 58 (permalink) Old 04-17-2019, 12:29 PM
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@AbandonedBronco Have you looked into any of these options for the oil charge?

EECOO 1/4SAE R134 2 oz Oil Injector R134A R12 R22 Car A/C AC Oil&Dye oz Injection Tool

https://www.walmart.com/ip/EECOO-1-4...Tool/311474085

Google: "R134 Oil Injector" for similar results



PAG Low 46 Viscosity Oil Charge with ICE 32ô (3 oz.)

https://www.walmart.com/ip/PAG-Low-4...3-oz/112737652

Google: "PAG r134a oil charge" for similar results
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File Type: jpg PAG Oil.jpg (26.8 KB, 23 views)
File Type: jpg Oil Injector.jpg (69.8 KB, 3 views)
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post #51 of 58 (permalink) Old 04-17-2019, 12:59 PM Thread Starter
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Thanks for the links. Yeah, that's what I've been starting to look at. The injector seems like it should do the trick.

Last is to figure out how to clean the system out, so I know I'm starting empty.


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post #52 of 58 (permalink) Old 04-17-2019, 06:12 PM
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Yup you need a flush kit and the flush isnít cheap. If everything is new you do not need to flush just vac.
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post #53 of 58 (permalink) Old 04-18-2019, 12:02 PM
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I never flush just vacuum it out lol...........still working.

90 xlt bronco 302 aod (ronco)
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post #54 of 58 (permalink) Old 04-19-2019, 02:19 PM Thread Starter
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Success!
Old oil removed, all charged up, ice cold A/C.


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post #55 of 58 (permalink) Old 04-19-2019, 03:20 PM
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Nice now your beer wonít get warn LOL.
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post #56 of 58 (permalink) Old 04-19-2019, 04:04 PM Thread Starter
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Nice now your beer won’t get warn LOL.



I did put in nice, deep cupholders and they're right in front of the vents!



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post #57 of 58 (permalink) Old 04-19-2019, 04:40 PM
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How did you end up going about getting the old oil out?
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post #58 of 58 (permalink) Old 04-19-2019, 04:42 PM Thread Starter
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There were a few methods listed on here that I think would have worked, but I just ended up having a shop do an evac. I didn't want to chance it.
After that, it was pretty straightforward.

I would have attempted it myself if I had an air compressor. But, one of those has been on my Christmas list for about 10 years, and still hasn't shown up.


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