Yes the infamous "I saw this in another thread" but to be honest if I was questioning someone on their thread I would say the same about what I see in this thread. I realize there is always conflicting information out there, that is why I responded. I just want to get it done correctly the (hopefully) first time.

I did find the TSB and it says for my year 4runner 120cc's. Reading further it says that the R12 mineral oil is not removed when doing the retrofit and that it remains and circulates in the A/C system. So based on that I think with current level of R12 mineral based oil and adding 100 (for your year) and 120 (for my year) is where you would end up with the approximately 230cc's of oil you quoted above.

Also, while not a toyota reference, I found this that says the oil capacity should be 7oz's which seems to be about what I read in the other thread.

http://www.techchoiceparts.com/refri...acities/toyota

I'm just trying to figure out the correct process here and hope I'm not coming across wrong. Like you, this is voodoo or black magic for me as well.

Thanks again.

 

Well, if you quoted something you saw on this page, you could just provide a link to this page. Then your reader could check it out themselves, and see if I had a source for my information (I try to, and I try to provide a link to something more authoritative than just me), or if I'm pulling it out of my, uh, back pocket.

So, thanks for the techchoiceparts cite. I see it lists quantities in ounces. My 1974 Ford Mustang II (as American as you could get) had a few SAE fasteners in the body, but every part near the engine was metric. Detroit car, 43 years ago. You can be pretty sure no Japanese manufacturer was specifying quantities in ounces. So did techchoiceparts get the milliliter quantities and just approximately convert them? Why? So, who knows? 7 ounces might be close. But since I can't tell where they got the information (and you know it didn't come from the manufacturer like that), i have to weigh that against what Toyota itself says.

You're not "wrong" in any way. But since all of us are plumbing the depths of the past looking for the most reliable information, it helps if we can read (and assess) the sources ourselves. At least when they seem to be contradictory.

 

Ok well let me be more definitive. Yes ounces is different than cc's. I'll do the math here and provide links. I work in the medical field an can tell you that 1cc=1ml. But instead of pulling it out of my back pocket, here's a link.

https://www.quora.com/How-do-I-conve...L-on-a-syringe

Next let's convert 7 ounces to cc, or mL which we've determined to be the same. Again a link so you can be sure.

http://www.convertunits.com/from/oz/to/ml

If you type in 7 ounces and hit the convert button this is what you get.

207.01470781249998

You seem like you want to argue everything I am bringing up and I don't know why. I thought I was polite and just trying to figure things out. That's what I love about forums, such a great place to share information. I truly just want to get things right, and that was the point of me posting in the first place. Also, figured it would help the next guy who is looking to take on this job himself.

 

As I re read your post I might have taken your being upset falsely. If so, I apologize.

I do however think the manufacturer does share information. At least regarding capacities.

And to go back to the TSB stating that the existing R12 is left in the system makes me wonder if the volume for R134a vs R12 is higher (such as 207cc vs 120cc). But I do not want to wonder and risk burning up my new compressor. I guess I will do more research and see what I can find.

 

What a very nice time of year to stumble across this thread. Thank you very much for the time you spent to write this up!