Ac capacity

[Thomas kittredge]

Can anyone give me the capacity of r134a that goes into a 91 ford ranger 2.3l.
AI is saying from 22 to 24 oz. Some other posts said 30 oz. My sticker on the core support is gone .

 

[Curious Hound]

Best thing is to have the larger quantity ready and available. But fill the system by watching pressures on the gauges and calculating proper operating pressures at current ambient temperature.

 

[Thomas kittredge]

Best thing is to have the larger quantity ready and available. But fill the system by watching pressures on the gauges and calculating proper operating pressures at current ambient temperature.

I actually just found it in my service manual. It says 32 oz plus 4 minus 0. I would guess that means minimum 32 but no more than 36. This is also for r12 so I don’t know if there is a difference.

 

[Shran]

https://www.4s.com/media/5421/four-seasons-capacity-guide.pdf

That says 36oz of R-12 plus 7oz of mineral oil.

If you're converting to R-134A, those numbers are NOT accurate. Start with 80% and add more if indicated by your gauges. I forget what oil you are supposed to use with conversions. You need to totally flush the mineral oil out of the system if you are converting it as well.

 

[Thomas kittredge]

yeah it is 36oz . The ford service manual has it listed in pounds , oz and a metric measurement. This system was converted new before I bought it. PAG oil is what is used.
Thanks for the info. I debating at this point if I just want to take it to the local shop and have them hook up their machine and do it.

 

[Shran]

Since it's converted already - can you tell if it has any refrigerant in the system or is it just low because of a slow leak?

If it's empty I would have your shop fill it and find the leak so you're not wasting refrigerant. If it's low, one of those refill kits is what I would use. The gauges on those are usually kinda janky but will get you close.

 

[Thomas kittredge]

Since it's converted already - can you tell if it has any refrigerant in the system or is it just low because of a slow leak?

If it's empty I would have your shop fill it and find the leak so you're not wasting refrigerant. If it's low, one of those refill kits is what I would use. The gauges on those are usually kinda janky but will get you close.

It’s empty, I had to clean the orifice . I have a vacuum pump and gage set.

 

[Shran]

Oh well in that case, vacuum that baby out and fill 'er up!

If the orifice tube was plugged I would flush out everything else first though...would be a bummer to have it plug up again with junk or find out that the compressor is coming apart.

 

[Curious Hound]

This^^^^^^. Big time. If there's trash in tje orifice, there's trash throughout the system. There should also be a reason for the trash - bad compressor.