Automotive Air Conditioning Information Forum (Archives)

Provided by www.ACkits.com

We've updated our forums!
Click here to visit the new forum

Archive Home

Search Auto AC Forum Archives

88 Jeep Cherokee: O-Ring Count for R134a Conversion?

RVC1 on Wed July 14, 2010 2:41 PM User is offline

Year: 1988
Make: Jeep (i.e., AMC?)
Model: Cherokee Limited
Engine Size: 4.0L
Refrigerant Type: R12 (Assuming)
Ambient Temp: 91
Pressure Low: N/A
Pressure High: N/A
Country of Origin: United States

I found the AC system on my 1988 Cherokee not cooling recently. I have determined that at least the evaporator core is bad. Other system components may also need to be replaced. However, all that remains is conveniently located underhood and I have spare known good parts.

I need the replace the o-rings for R134a. So far, I have located a total of six o-rings:

(2) expansion valve/evaporator core interface,
(1) low pressure valve/line to evaporator interface,
(1) low pressure valve/compressor interface,
(1) high pressure valve/condenser line interface,
(1) high pressure valve/compressor interface.

Is my count total correct? If not please advise as to additional locations.

I can only purchase AC o-rings individually at local auto parts stores so I must be certain I identify all of them in the system in order to convert to R134a...the first time.

Thanks,

Rick

Edited: Wed July 14, 2010 at 2:42 PM by RVC1

HECAT on Wed July 14, 2010 3:18 PM User is offline

For a typical TXV system, you will have...

2 at the compressor.
2 at the condenser.
2 at the filter.
2 at the evap (sometimes 4 w/ block TXV).

So my count is 8-10. O-ring kits make this a whole lot easier.

-------------------------



HECAT: www.hecatinc.com You support the Forum when you consider www.ackits.com for your a/c parts.

FLUSHING TECHNICAL PAPER vs2.pdf 

bohica2xo on Wed July 14, 2010 8:51 PM User is offline

An O ring kit is usually the best choice, especially if you have a long drive to the parts store...

There is a 15 buck kit available with all of the O rings in that system - and several spares.

I do see two other seal kits for that vehicle however. Dodge / Chrysler / Jeep used some metal seals, as well as some sealing washers in some places. Your vehicle may need one or more of these seals, depending on what D/C/J was up to that month...

Look HERE for the sealing kits & parts to fit your Cherokee.

B.

-------------------------
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

RVC1 on Wed July 14, 2010 9:15 PM User is offline

Yes, I did see these o-ring kits. My discussion with the staff at AMA indicated I must separate each connection in the system and examine it for a seal or o-ring in order to determine what quantity of each I will need.

Rick

RVC1 on Thu July 15, 2010 4:04 PM User is offline

So now I have read the Hecat flushing procedure document and some posts on this subject. It appears I would have at most three components that one might want to flush. These are:

1. Evaporator core (aluminum one; new from AMA/ACKITS.com),
2. Condenser,
3. Low pressure line.

My high pressure line features a metal can that may be a filter or a muffler so I am not to flush this line, the drier, the expansion valve or the compressor with flush solvent.

I have two serpentine condensers; one that came with a parts vehicle purchase; it's connections are open to ambient conditions. The second should be good as I had the AC system of my 89 Cherokee repaired 2-3 years ago and it required a new condenser, drier and compressor valves. I am fairly certain I converted the 1989 Cherokee to R134a so this is consistent with the new drier for the system. The presence of two serpentine condensers makes is difficult to reach for a parallel flow condenser to return this system to operation.

My evaporator core had several small pinholes in one of the tubes (copper?). I did not observe any brown oil on its exterior surfaces when I examined it but I did observe some brown oil escape when I loosened the expansion valve/line connections.

I have not had time to disassemble the sytem completely yet.

Rick

Back to Automotive Air Conditioning Forum

We've updated our forums!
Click here to visit the new forum

Archive Home

Copyright © 2016 Arizona Mobile Air Inc.