International Full Size Jeep Association
Home Forums Reader's Rigs Tech Library Trail Stories FSJ-List
International Full Size Jeep Association  

Go Back   International Full Size Jeep Association > Tire Kickin' > General FSJ Tech

Reply
 
Thread Tools Search this Thread Display Modes
  #21  
Old 07-22-2020, 09:57 PM
mantonas mantonas is offline
230 Tornado
 
Join Date: Apr 16, 2017
Location: Knoxville, TN
Posts: 17
If I replaced the compressor with another York unit, how do I add oil? Does it go into the "crankcase" of the compressor itself before it's installed, or do I just get one of those cans and feed it into the system the same way you add refrigerant?
Reply With Quote
  #22  
Old 07-24-2020, 05:29 PM
Dave Jeeper Dave Jeeper is offline
232 I6
 
Join Date: Sep 08, 2019
Location: Denver, CO
Posts: 67
In the photo of the compressor that was posted, there is a large hex nut on the side of the compressor, next to the edge of the radiator hose. Normally the compressor would be oriented with that hex nut on the top of the compressor and I believe that is where the dipstick would be put in after removing the nut (compressor in use must have pressure removed before opening and must be evacuated-with a vacuum pump- afterwards before recharging).


An AC system takes a certain amount of oil, some systems take 8 oz, not sure what this one takes. Some of the oil circulates around with the freon. There will be some in the compressor, some in the accumulator/dryer, some in the evaporator. When replacing a part, such as the compressor, drain the oil from the used part and measure how many ounces were in the used part. If the new part (compressor) comes with oil, then drain it, and put new oil back in the compressor equal to the amount of used oil removed from the used part. This will work if oil has not leaked out of the system.



If there are signs of leaked oil around a loose connection, then you may need to add more oil than was in the compressor.



If the valves in the compressor went bad and shattered, then you will have to replace more parts than just the compressor as the broken parts travel upstream with the high pressure freon.


Mineral oil is used in the original configuration with freon 12. There are different weight PAG oils used with R134a if the system has been converted. Best to try to figure out which PAG oil is in the system if converted. There may be info on the compressor or a conversion sticker stating which oil is in the system.


Good luck,
David
Reply With Quote
  #23  
Old 07-25-2020, 08:58 AM
mantonas mantonas is offline
230 Tornado
 
Join Date: Apr 16, 2017
Location: Knoxville, TN
Posts: 17
Ok, don't judge me, but I decided that I didn't want to mess with replacing hoses or fooling around with the A/C box inside the car to remove the expansion valve, so I bought a compressor, receiver/dryer, and condensor from Rockauto and I'm going to replace them all and put in R134 plus some amount of oil. Since I'm not removing the expansion valve there's not gonna be a lot of flushing going on. If this doesn't work or works but doesn't last a long time or ends up damaging other components, oh well, but if I get one summer out of it I will be happy. As I said, please don't judge.

The new compressor says it's filled with 14.1 oz. of PAG 100 oil. I will do what was recommended above and measure how much oil was in the old compressor and go from there. I guess I will try to stick with PAG 100 oil because I think the oil is mostly there to lubricate the moving parts of the compressor and it came with PAG 100 so that must be what it needs.

Now I just want to make sure I have all the right parts, and I guess I'm mostly thinking about O-rings or other gaskets. I don't plan to disconnect the hoses from the service valves, so I probably need new O-rings or gaskets (I don't know which) between the service valves and the compressor. What do I need there?

Also, the hose that connects the compressor to the condenser: as I said I don't plan to disconnect that at the service valve, but I do at the condenser because I'm replacing the condenser. That's a big hose; is it a #10? #12? What size O-ring does that take? I picked up a pack of O-rings at Advance yesterday that I think will probably give me what I need for the smaller liquid line hose connections but it didnt look like it included big enough O-rings for the compressor discharge line.

Thanks!
Reply With Quote
  #24  
Old 07-25-2020, 09:24 AM
wiley-moeracing wiley-moeracing is offline
350 Buick
 
Join Date: Feb 15, 2010
Location: arizona
Posts: 1,233
You will still need to remove the expansion valve to flush the system properly. It should not be that hard to get to if it is the under dash system. Most o ring kits should have the correct size in them for your system.
Reply With Quote
  #25  
Old 07-26-2020, 10:35 PM
SJTD SJTD is offline
350 Buick
 
Join Date: Apr 26, 2012
Location: Lompoc and Sunland, CA
Posts: 1,460
I agree. Everything I've read says you don't want to mix PAG with the mineral oil used with R12.

But it's your vehicle.
__________________
Sic friatur crustulum

'84 GW with Nissan SD33T, early Chev NV4500, 300, narrowed Ford reverse 44, narrowed Ford 60, SOA/reversed shackle in fornt, lowered mount/flipped shackle in rear.
Reply With Quote
  #26  
Old 07-29-2020, 08:54 PM
mantonas mantonas is offline
230 Tornado
 
Join Date: Apr 16, 2017
Location: Knoxville, TN
Posts: 17
As far as ease of removing the expansion valve because it's an under dash system: compared to what?!? I love my Grand Wagoneers, and I've got several other AMCs that I also love, but I am a recovering Mopar guy, and they all had the expansion valve in the engine compartment. You can easily remove it and flush the evaporator. God forbid my ever owning a (barf) GM vehicle, but they're even easier: evaporator in the engine compartment!

I guess it's easy compared to other AMC vehicles which also have the expansion valve on the interior side of the firewall but all up inside the dash instead of an underdash system. I think it's extraordinarily daunting to even think about removing the expansion valve just so I can flush the evaporator. If I ever get to the point where I have to do that, then screw it, I'm gonna replace EVERYTHING.

For now, here's my under 300 dollar plan (remember, a previous owner already converted it to R134a)

New York-style compressor, new condenser, new receiver dryer (Rockauto)

4.5 oz of PAG 100 oil in the compressor

Two cans of R134a refrigerant

I found the weird square-cross-section gaskets for the service valves to the compressor at O'Reilly, so I'm not going to disconnect the hoses from the service valves, I'm going to disconnect the service valves from the compressor to replace the compressor.

I have bought multiple O-ring kits but none of them seem to have O-rings big enough for #10 hoses, so I ordered a kit from Jeepair.com. it was supposed to get here yesterday, then it was delayed to today, now it's delayed til tomorrow. Not having those O-rings is the only thing that might derail me doing it this weekend.

Reuse the clutch.

Rent a vacuum pump, get rid of the existing refrigerant, pull a good vacuum, add refrigerant

If that doesnt work I'm going to admit defeat and buy a minivan.
Reply With Quote
  #27  
Old 07-29-2020, 10:55 PM
SJTD SJTD is offline
350 Buick
 
Join Date: Apr 26, 2012
Location: Lompoc and Sunland, CA
Posts: 1,460
Sounds good. I missed where it was already converted to 134, presumably the system was flushed at that time and filled with PAG oil.
__________________
Sic friatur crustulum

'84 GW with Nissan SD33T, early Chev NV4500, 300, narrowed Ford reverse 44, narrowed Ford 60, SOA/reversed shackle in fornt, lowered mount/flipped shackle in rear.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Air conditioning condenser alwomac General FSJ Tech 6 09-03-2012 09:59 PM
Air Conditioning JeepJ101978 General FSJ Discussion 4 11-29-2011 10:56 PM
Air conditioning. CJ the noisemaker General FSJ Discussion 9 05-23-2011 08:43 AM
Time to hook up the Air Conditioning. Couple of questions for experts will e General FSJ Discussion 9 08-07-2009 10:46 PM
air conditioning plugged? dusty General FSJ Tech 3 05-22-2008 05:02 PM


All times are GMT -6. The time now is 07:11 AM.


Powered by vBulletin Version 3.5.4
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
corner corner