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Unread 04-11-2010, 07:30 AM   #1
Louie4
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A/C Refurbish

Well I'm redoing my factory A/C system that still works but is low on R-12 and now I'm going to R-134a. I've already evacuated the system and I've removed the evaporator unit from underneath the dash. I'm going to clean it up and seal up any cracks and insulate it the best I can. I know I'm going to need a new drier and I'm going to replace the expansion valve. My compressor is good so that will stay.

My questions are:

-Should I spray some sort of cleaner through my hoses to remove the old oil?
(Did use compressed air to get some out).

-I'm going to get the standard A/C drier but on Jeepair.com there is an option for a compression fitting? Mine I just unscrewed the lines so I don't think I need that one just the standard.

-Should I replace the high pressure switch on the drier?

-Any good tips for insulating besides standard foam from Lowe's?

-What is the conversion factor for the amount of R-12 to R-134a? I have been told you can't put the recommended R-12 amount for the R-134a.

-Anything else I should know?

Before someone ask why I'm doing this; My gf and co-pilot melts down here in the Summer. Also she asked why I could spend $XXXX.XX of dollars on wheels and tires but not the $100 or so to keep her more comfortable when wheeling. So there you go. Since I have a semi-working A/C I couldn't argue.

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Last edited by Louie4; 04-11-2010 at 08:08 AM..
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Unread 04-11-2010, 07:39 AM   #2
Burnerman
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Wow. I just bought a retrofit kit at Walmart and blew the cans in after putting the 134a access valve caps on. I used it for 2yrs with no issues. It cost me $50 IIRC. It still had a full charge and worked fine right up until I sucked it out for my engine swap.
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Unread 04-11-2010, 07:48 AM   #3
Louie4
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Quote:
Originally Posted by Burnerman View Post
Wow. I just bought a retrofit kit at Walmart and blew the cans in after putting the 134a access valve caps on. I used it for 2yrs with no issues. It cost me $50 IIRC. It still had a full charge and worked fine right up until I sucked it out for my engine swap.
When mine did have a full charge of R-12 it worked good but would turn warm for a period and then back to cold. I asked one of the other mechanics at my shop what he thought and he said the expansion valve might be freezing up and is having to thaw out. Since a new one is only $14.99 why not.

I did the same thing you did with a beater '86 Civic. I just pulled a compressor from a junkyard, put a vacuum on it and filled it with oil and refrigerant. It worked great until my head gasket started leaking. The extra heat from the A/C was causing the motor to get hot so I had to stop using it.
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Unread 04-11-2010, 08:40 AM   #4
Cajun90YJ
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.87 is the conversion rate when going to 134a from r12 so how ever much r12 it takes multiply it by .87 and thats how much 134 you need. I would not change the switch unless it was bad, if it aint broke dont fix it. As far as cleaning the lines out, you can use some brake cleaner in them then blow it out with air, but dont get the cleaner in the compressor.
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Unread 04-11-2010, 07:29 PM   #5
Louie4
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Quote:
Originally Posted by Cajun90YJ View Post
.87 is the conversion rate when going to 134a from r12 so how ever much r12 it takes multiply it by .87 and thats how much 134 you need. I would not change the switch unless it was bad, if it aint broke dont fix it. As far as cleaning the lines out, you can use some brake cleaner in them then blow it out with air, but dont get the cleaner in the compressor.
Thanks! I got some A/C flush in an aerosol can to flush every component then blow out with compressed air. So far I have the evaporator out cleaning the coils, just ordered the o-ring kit and the drier, and cleaning the housing. The housing has some cracks so I need to get some JB weld on that. I'll take pics and post tomorrow.
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Unread 04-11-2010, 08:55 PM   #6
Cajun90YJ
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You can also clean out the fins on the condenser to help the air flow, and if you have the $$ put an electric fan, it will help with cooling at low speeds.
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Unread 04-11-2010, 09:04 PM   #7
Louie4
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Originally Posted by Cajun90YJ View Post
You can also clean out the fins on the condenser to help the air flow, and if you have the $$ put an electric fan, it will help with cooling at low speeds.
I keep the condenser pretty clean so that should be good to go. I tried the taurus fan swap but it was way too thick to fit between the water pump and radiator.

I'm planning on getting the 11 oz oil and refrigerant can. It has 8 oz of oil and 3 oz of refrigerant. I think that 8 oz will be plenty.
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Unread 04-12-2010, 09:44 PM   #8
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Well I started revamping the A/C and I actually took a bunch of pics because I found my gf's camera in the back of the seat in the saddle bag. It has been lost since last August when we went wheeling at Beasley in North Georgia.

How I began with all the parts and what not:


The lower part of the housing with the thermostat still in:


The top part of the housing with a crack in it:
.


The evaporator. Pretty dirty. I cleaned it with some compressed air and a small wire brush:


What I used to flush the evaporator and condenser:


Will finish posting pics tomorrow.
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Unread 04-13-2010, 09:11 AM   #9
Louie4
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I began cleaning the housing and taking everything apart. I took the whole under dash unit out then disassembled from there.

I took the expansion valve off the evaporator and oil started to pour out every where. Once I had the evaporator off I used a wire brush and compressed air to clean it:



Flushing the evaporator:
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Unread 04-13-2010, 09:14 AM   #10
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Went out to the jeep to flush the condenser:



I used an empty gallon oil container to catch the cleaner from the line. No I did not flush the compressor. That's a no-no:

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Unread 04-15-2010, 02:41 PM   #11
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Nice work on the thread. I wish it would have been posted about a week or two ago.

Take a look back at my thread if you don't mind I had another question.
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Unread 04-15-2010, 02:54 PM   #12
Louie4
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I still have some more pics to post. I received the wrong drier though so I'm waiting for that.
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Unread 04-15-2010, 10:06 PM   #13
dodger889
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An easy way to refill with r134 is to use a gauge on the low pressure side ( the fill side ) to about 25 to no more than 30 psi . This pressure is with the compressor running. Now this might take a few touch up after a bit. Test after about a day of use or if it does not stay cold . Then is should about freeze your rear end out of the jeep. Mine still has r 12 and will freeze your hand in just a little bit and enough to make the wife start redirecting the air flow. So good luck with your rebuild for the A/C
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Unread 07-21-2013, 12:17 PM   #14
Louie4
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Three years later and I finally get around to finishing this. I just ordered a new condenser so this thread may not be useless.

I ordered the new condenser from jeepair.com for $149.99. Shipping was $15 so not too bad. One thing I need to do is take my hoses off in the engine bay and make sure they are clean and free of debris. I should probably buy some more A/C flush and do that again.

I'll post pics and actually update this in a week or so. A major force behind this project is my wife who I've been telling I would do this one fix for her.

I posted up some pics of the cracked housing. Well I fixed that with JB weld back in '10 and also wrapped the hoses to the evaporator in insulation.





I plan on taking it to a shop after I'm done to pull a vacuum and then put the R-134a in. Since I've started this I have a Taurus fan for cooling so I will tap off the clutch wire to the relay to kick the low fan speed on when the compressor is running.
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Unread 07-21-2013, 01:34 PM   #15
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I just used rubbing alcohol to clean out the system and then refilled with a can ofboil and some cans of freon from Walmart. mine works great. I didn't change any parts or anything like that but I think adding an electric fan is a good idea. mine gets to almost 3/4 on the temp gage when the ac is on
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