If I recall, the one time I replaced the compressor it was already packed with oil.

 

If you are replacing every component you just need to find the total fill for the system. I think I found it easily enough but I don't recall where. Haynes manual? Parts store lookup? Google? Owner's manual?

If you are only replacing the compressor you measure the oil in it and replace just that much because an unknown amount of oil is hiding in the rest of the system and you don't want to overfill it. It sounds like you are replacing the whole system so you need a full fill. I'd probably not dump it all in the compressor though and once you have it all connected give the compressor a few spins by hand to get the excess oil out before you let the engine spin it so you don't risk trying to compress solid oil and hurting the valves.

 

I've found a chart via Google that says that a full fill is 7.75oz, but it says PAG100 and the FSM is very specific that it should be PAG ND8 (aka PAG46). So I don't know how accurate that is.

 

I went into the 93 FSM (p.24-34,35) and the 96 FSM says the exact same thing about using only PAG ND8 with the 10PA17 compressor when "servicing" the system. I may be interpreting this different than you but believe their point is don't be adding a different type oil, like PAG 100, when it already has the PAG ND8 (PAG 46) in it.

Normally new compressors come with oil already in them with a plate/gasket on top where the high-pressure port manifold attaches. There's a good chance the compressor is going to come with PAG 100 oil in it and not the PAG ND8. Plus you don't have any of ND8 oil left in your system so don't believe it's going to be a problem in switching over to total PAG 100.

Believe my new Denso compressor came with about 4-5 oz of PAG 100 oil in it. I drained it out, added enough PAG 100 from a bottle to equal 7.75 oz, then added 5 oz to the compressor before I put the high-pressure manifold on and 2.75 oz to the accumulator. Sorry, I don't know how to pour 2oz up a horizontal evaporator tube or 1oz in a horizontal condenser fitting.

It's kinda funny they talk about how quickly you're supposed to cap a bottle of PAG oil so you don't contaminate it yet you're supposed to drain it out of a compressor into a measuring cup!

I checked a local Firestone shop and they wanted $175 to evacuate and recharge my 96 4.0 AC system. Like he!!, went and got a loaner AC vacuum pump and set of vacuum gauges while did everything myself. Saved $140-$150.

Fairly easy when you know your going to add 28oz of 134a along with 7.75 oz of PAG oil to a completely empty system. I even left the vacuum pulled down overnight to make sure I didn't have any leaks ahead of time. Good luck!

 

I recall finding the total fill amt. easily somewhere too. Seems like it was the 94 FSM.

The other option is add up all the single component amounts.

 

I also go this from here but the other pics were from the service manual. http://www.techchoiceparts.com/refrigerant-and-oil-capacities/jeep

 

The FSM gives specific single component amounts for everything except the compressor. It assumes that you'll always have an old compressor and that it won't have lost an indeterminate amount of oil.

Going by PolkaPower's chart above from the FSM (and assuming no oil in the compressor), if the AC system needs 7.44 oz, do I just fill the compressor with 7.44 oz, spin it by hand a few times to start distributing it through the system, and then drive off to get the vacuum and recharge done? I don't need to ask for any more oil to be added?

I found that techchoiceparts.com chart earlier, and I'm not sure how much I trust it given that it lists PAG100 oil instead of PAG46.

 

Or... if the compressor arrives dry, can I connect everything up dry (apart from PAG on the O-rings) and then drive it to the shop to be given a full fill as long as I ensure that the clutch can't engage until the compressor has been filled with oil?

 

The way I looked at that was to give each new component the amount listed for each component subtract that from the total charge and put the remainder in the compressor. The oil will pool in the evaporator an accumulator so you want to lessen the time it takes for oil to return to the compressor. PAG 100 is what they call unversal PAG. You also want to spin the comp by hand 50 times to seat the rings in the cylinder wall. Pag 46 is what is the recommended spec I'm pretty sure for 96-98. This pag was created by nippendenso specifically for their comps. I used this stuff because the formulation chemical chain was altered so as to resist acid formation. I'm not sure if the pag 46 is a must do for the early ZJ's or not, and sometimes it is difficult to find except at a Toyota dealer for 28.00 a container. So that is why I probably used the stuff pictured.

It will probably be fine doing the way you described if it comes dry, but I'm thinking it won't. I drained and measured the oil that comes with the comp and seems like it was a total charge amount. Be sure to tug a little on all the spring lock connections to be sure they are fully seated and holding.

 

End of bottle screws on to a charge hose and container fits into a caulk gun. With a clean old hose with the end cut off you can put the oil wherever you want it to go. Heres an interesting read on oils.
http://acsource.net/acforum/viewtopic.php?f=1&t=4293

My comp was a new OE mopar compressor that is discontinued, pretty sure it was loaded with pag 46. Which brand condenser did you use AVR? Just curious.

 

Which brand condenser did you use AVR? Just curious.

Spectra Premium from RockAuto. I think the evap is the same, but I bought that about 3 years ago (I've *really* been putting this job off) so I can't remember now...

 

The first time I replaced my compressor was after I sunk my 95 5.2 really bad and coated the engine with mud. I didn't know anything about how to do it or have and reading material to go on either. I just evacuated the line and unbolted the compressor, put the new one on, and filled it up lol. It worked but it was so wrong on so many levels.

 

I bought these:
http://www.harborfreight.com/25-cfm-vacuum-pump-61245.html
http://www.harborfreight.com/ac-r134a-manifold-gauge-set-60806.html

I'm pretty sure they are the same parts from that set you posted. With discount coupons I think I got them both for around $110.

 

Probably doesn't matter, I just always try to err on the safe side, it a habit I can't seem to get rid of.

 

Compressor has arrived, and it's dry. So I guess I can go with PAG100? The instructions say "use lubricant specified for your application" and to put half in the compressor and half in the accumulator.

 

I hate to bring back old threads...but did anybody read the label on the rad support? It states the amount of charge, oil type and amount too. PAG 46!!!

BTW, too much oil is no good either!