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plongson on Thu March 13, 2008 4:51 PM User is offlineView users profile

Year: 1984
Make: Jeep
Model: Cherokee
Engine Size: 2.8
Refrigerant Type: 134a
Country of Origin: United States

Hi guys,
Been gone for a while working on other projects but I still have the Jeep.
In anticipation of the warm months coming up I was checking the AC and it still works after the conversion just...so-so. As a matter of fact, it works just like I left it, not as cool as I'd hoped. As you folks have told me, these units were not stellar performers even when new and so are not good candidates for conversion. I should'a listened...

Well, I decided I’m going to go back to R-12…and hope like heck it’s worth the work. I have acquired 3 12oz cans of NOS DuPont, I have two new r12 valves and am just about ready to jump in. It’s also running BVA Auto 100 now.

Is there any thing I should look out for? I’m going to try to have the 134a recovered, take it home and simply swap valves, vacuum and charge.

Let me know if I’m on the right track…

THANKS!!


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Vibration Analyst in Power Generation

Chick on Thu March 13, 2008 8:06 PM User is offlineView users profile

The BVA auto 100 will work fine with R12. If need be, add an extra ounce if you suspect you had a leak.. But vacuum and charge the correct weight of R12 back in and it should be fine..I believe there is a sightglass on the drier on that one??

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

plongson on Fri March 14, 2008 8:54 AM User is offlineView users profile

Hi Chick, thanks for the reply...
Yes this dryer has a sight glass. My book calls for 32oz of refrigerant so with 36 I should be good to go even with hose loss. There appears to be no leaks after about a year of service. The whole 134 thing was really a good trial because I had issues with a crummy rebuilt compressor and some minor leaks that slowly took their toll. The whole system is pretty solid now and should be ready for a return to R12. As pricy as this stuff is, you really dont want to make any mistakes!

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Vibration Analyst in Power Generation

Edited: Fri March 14, 2008 at 8:58 AM by plongson

Chick on Fri March 14, 2008 10:05 AM User is offlineView users profile

sounds good, charge the system amount, but clear the sight glass with R12. make sure your fan clutch is in good shape, and the electric fan if equipped is working...Hope this helps..

PS: personally, if it were mine, I would change the drier and add back the oil amount called for,, but should be fine with a good vacuum pulled...Good luck

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Edited: Fri March 14, 2008 at 10:06 AM by Chick

Cussboy on Sat March 15, 2008 2:48 PM User is offline

On this vehicle the drier is located in a weird place, think the radiator needs to come out to access it. So I might skip that unless necessary, in this case. My '84 Cherokee with that engine worked fine, R-12, Arizona then one day the compessor locked up. This was before I knew anything about this site, and the replacement compressors I could locate were about $700, so I picked up one from a jeep-only wrecking yard for $75, worked fine as long as I had that Jeep. I liked the manual service valves; I believe I replaced that compressor without discharging the system.

Edited: Sat March 15, 2008 at 2:51 PM by Cussboy

plongson on Sat March 15, 2008 3:09 PM User is offlineView users profile

Well, wish me luck. The new valves and O-rings are in and I'm pulling a vacuum right now. I wish I had a micron gauge/meter instead of just a vacuum gauge, I always question them.

This thing never lost a drop after the conversion, but now pulling about 27"Hg (29.68" right now), if I shut off the valves it looses a few inches in 15 mins. I am using an older gauge R12 gauge set and I question the integrety of the rubbers. Sometimes don't these things hold pressure great but loose small amounts of vacuum??

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Vibration Analyst in Power Generation

Edited: Sat March 15, 2008 at 4:11 PM by plongson

Chick on Sat March 15, 2008 7:00 PM User is offlineView users profile

Yes, sometimes the vacuum leak is actually the gauges leaking. If you're sure about the integrity of the job, then charge it up..Let us know how it comes out..I would add just a bit of UV dye if you don't the last time though....Good luck

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

plongson on Sat March 15, 2008 9:01 PM User is offlineView users profile

Well I dropped the hammer. I think the system is tight. What a trip working with r12 vs 134r. The ambient was about 60° and I warmed the three cans in water to probably +/- 100° and was able to get in 3-12oz cans in and never run the compressor. The system calls for 32 oz and with loss I figure it got 34 loaded.

Center register got as low as 40° but cycled around 42°-43°. LS was about 5psi and HS was about 125psi. No bubbles, I thought it would show some when it cycled.

I had dye from last go-round, and being familiar with the system I added about 1oz of oil.

I'm pretty stoked right now, it is WAY better than the 134 was two days ago!!

Lets keep the fingers crossed...

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Vibration Analyst in Power Generation

Chick on Sat March 15, 2008 9:07 PM User is offlineView users profile

It is very hard to go by pressures when the ambient is below 70 degrees, and sometimes even 75... Looks like a winner to me though...When the temps get higher, like around 80, you could check your pressures, but I don't think you'll need to.. Just check for bubbles.... Good job....

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

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