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Old 05-22-2019, 01:44 PM
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A/C only "kinda" cool air...

Hey everyone... I've done several searches here but can't seem to find guidance on this (what I assume is a) straightforward task.

My 95 YJ that I just bought used a couple months ago has the add-on A/C unit under the dash. Everything seems to work just fine, but the output of air is barely cool. What's the process for recharging the system?

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Old 05-22-2019, 01:47 PM
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Forgot to add: All the hoses and connections look solid... no rot, nothing looks worn out.

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Old 05-22-2019, 01:51 PM   #3
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Evacuate, hold vacuum for 30 minutes then pump up

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Old 05-22-2019, 02:02 PM
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Evacuate, hold vacuum for 30 minutes then pump up

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Sorry, I should have clarified: I need it explained to me a little more than that. Evacuate what, and how? How do I hold vacuum? What and how am I pumping up?

The only time I've done something similar was on a modern car and it was just one of those cans you attach to a valve.
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Old 05-22-2019, 03:07 PM   #5
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The cans are the easiest way to overcharge and blow your compressor. Ill advised to use.

Your local auto parts loan a tool program will have an vacuum pump you can Buy/Return after use, as well as a set of gauges with all the necessary hoses and fittings.

If you do not already know how to use the above tools, I would suggest you bite the bullet and shop around for a reasonable shop, Or spend a couple hours watching several youtube vids to accustom yourself with properly charging your system.

Its really not that difficult, but hard to explain without the visual.

You can buy the can with the little gauge that tells you if it's charged, but will only be adding to the old Freon which may be contaminated or mixed with too much air making it less effective. As Rubisean posted, you get a much more effective charge by vacuuming everything out of the system and refilling with all new refrigerant. The pupose of waiting 30 mins is to check to make sure there are no leaks in the system. If there is a leak it will not hold negative pressure and will allow air back into the system defeating the purpose of replacing the Freon.

Hope my explanation helps.
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Old 05-22-2019, 03:29 PM   #6
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Sorry, I should have clarified: I need it explained to me a little more than that. Evacuate what, and how? How do I hold vacuum? What and how am I pumping up?

The only time I've done something similar was on a modern car and it was just one of those cans you attach to a valve.
This tells me that you should seek out a professional. It's really easy to screw up A/C if you don't know what you're doing. Do you know if it is R-12 or R-134A they are by no means compatible, the oils that those two systems is critical.
It could be you have an issue somewhere else in the system beside the amount of refrigerant in the system. Other components need to be changed if the system is opened up or leaking. Don't throw good money away by trying to fix this yourself
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Old 05-22-2019, 04:08 PM
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Great advice, thanks guys... I've got 2 shops that have done solid work for me for over 20 years now & I'll have them take a look. While I do have a little mechanical skill (basic stuff on engines) & love learning new stuff, I'll leave this one to the pros.

Thanks again & looking forward to feeling some chill. 8)
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Old 05-22-2019, 04:29 PM   #8
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Last .02 worth. Jeep A/C is mediocre at best, just no way to seal the cab up to get it frigid no matter how cold it's blowing.

'95's came with the "New" R134a refrigerant. I doubt that it's been converted backwards, but worth checking out. Pretty easy to tell from the hose connections. If they look like 134a without adapters then its 134a, If it looks like r-12 with 134a adapters then it's been converted over from r-12...Most likely, but who can tell from some of the PO's work we've seen.

If you want to learn about servicing your own A/C for all your vehicles the Jeep is about the easiest to learn on as all the major components are easier to access than on more contemporary vehicles, with less digital and vacuum controls involved.

You can rent a pump as needed, and get a decent set of gauges for around $60.00. as long as you don't blow your compressor, even if you have a few trial and error sessions leaning how to work the gauge set, it's still cheaper than going to a shop.

Good luck on your decision
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Old 05-22-2019, 04:32 PM   #9
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Yeah, my '94 came with R-12 and remains that way to this day.
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Old 05-22-2019, 04:33 PM   #10
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Yeah, my '94 came with R-12 and remains that way to this day.
I hear you can still get r-12 from Mexico for about $20.00 a can
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Old 05-22-2019, 04:35 PM   #11
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Great advice, thanks guys... I've got 2 shops that have done solid work for me for over 20 years now & I'll have them take a look. While I do have a little mechanical skill (basic stuff on engines) & love learning new stuff, I'll leave this one to the pros.

Thanks again & looking forward to feeling some chill. 8)
Since you have a long term relationship with these shops you should be able to be in the bay while they are working on it. Ask questions and keep your eyes open you will learn. A/C is easy enough to work on if you have a little experience.
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Old 05-22-2019, 04:38 PM   #12
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I hear you can still get r-12 from Mexico for about $20.00 a can

LoL... it can be acquired in the states you just need a license to get it. If and when something fails in that system it will be converted to 134.
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Old 05-22-2019, 04:44 PM   #13
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Last .02 worth. Jeep A/C is mediocre at best,
When I bought mine the PO seemed to think A/C was a strong selling point. I sat there bewildered. Why would you want or need it? In my mind I would never consider one of these vehicles as a daily, or even something you drive in freezing cold with doors and stuff on it but it was his daily driver! Doors, top and all of that on it all the time so then it made sense. I'm not sure if mine works or not but I guarantee you I'm getting the thermo out tonight and checking it out.
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Old 05-22-2019, 06:14 PM   #14
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Mine didn't work very well when I bought it. For S&G I bought a new Drier, fixed a leak and gave it a recharge and it worked great. Driving down the road it wasn't so bad, blew just enough cool air on my knees to keep the carpet cool (LOL) but without a computer and idle adjustment it would want to stall out at stoplights without me bumping the idle up too high.

A/C in AZ during the summer... Pricelss.
A/c in an open Jeep in AZ...Worthless.

I've since pulled it out and learned to put up with the heat in favor of Fresh Air and Fun of running around Topless.

Did I mention She thinks my Tractors Sexy???
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Old 05-22-2019, 06:42 PM   #15
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It's a "Dry Heat" in AZ!! Right, still registers near-death for humans.
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Old 05-23-2019, 12:58 AM
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'95's came with the "New" R134a refrigerant. I doubt that it's been converted backwards, but worth checking out.
The guy I bought it from said he had the A/C unit added at some point & he had it from 2012 until recently, so my money was already on it being R134 (but I know, I know... you never know with old Jeeps)
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Old 05-23-2019, 08:59 AM   #17
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I am very simple minded, and have dozen a/c recharge.

You can RENT the vacuum pump AND manifold gauges from Auto Zone or Oreillys!

Ok, to Vacuum/Evacuate the system, why? The refrigerant breaks down over time, just like oil, and needs to be replaced or the system has a slow leak. Evacuating the system gets rid of air, old refrigerant, and moisture. To evac, you simply attach a vacuum pump that sucks on the system, creating suction and essentially lowers the boiling temp and evaporates everything.
The easier analogy: it is kinda like a turkey baster. You don’t fill a baster by shoving more in, you create suction so the liquid is PULLED in. Same with a vacuum pump. You are creating a suction that pulls OUT the contaminants. Then when you fill it, it PULLS in the new refrigerant. If you can understand that, you are 50% there.

Now, the refrigerant. There is zero guessing about how much refrigerant to add, zero! Your manufacturer of your system will have an exact amount for your system. You simply add that much and you are done. Some will say do it by weight, stop! That is bs.

Leaks? Yes, that is another step but don’t worry about that until you get there. R134 needs to be changed out every 4-5 years to be effective, that’s what they say, so if it is mildly cool, I doubt you have a leak.

I have done dozens of recharging this way with zero leaks to date. I have done them all with using the exact ounces specified. I have never added oil. I have never blown a compressor.

I once looked into paying for a recharge. I was told that it cost $90 just to pull it in! I rented the stuff and did it myself for $36.
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