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Old 06-24-2016, 02:57 PM   #1
TempleUWS6
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Default What A/C components to pull from a '93

So I know '93 was the only year for r134 and there is one at a PnP by my parents house. I know the compressor is key, but what else is proprietary to '93 and r134?

I have a '90 and a '92, and would like to get both cars a/c to work. Can the '92 be run on r134 if I just change the compressor to the '93 one?
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Old 06-24-2016, 03:08 PM   #2
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681-4 A/C Changeover (Convert)
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Old 06-24-2016, 03:27 PM   #3
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Too much to type. The systems from 91-93 are completely different from the systems used from 1975-1990. If you are going to convert your 1990, pull everything, including the AC/heater case. If all you are trying to do is change your 1992 R-12 system to an R-134 system, you need the compressor, condenser and all the lines.
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Old 06-24-2016, 03:39 PM   #4
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Uhh, have to disagree. We used to convert all the r12 cars to 134. Just need to flush the system completely and convert the fittings to 134 and of course change out the receiver/dryer and expansion valve. Also drain the compressor oil and refill. Running 134 in my 89 with electric fan.
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Old 06-24-2016, 03:49 PM   #5
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Originally Posted by 2manyturbos View Post
Too much to type. The systems from 91-93 are completely different from the systems used from 1975-1990. If you are going to convert your 1990, pull everything, including the AC/heater case. If all you are trying to do is change your 1992 R-12 system to an R-134 system, you need the compressor, condenser and all the lines.
I'm thinking this is probably going to be my plan. Retro fit the '92 to run R134 using the '93 parts and get the '90 running on something else. I know I still have a lot of research to do, but will only have access to the '93 this weekend, so I need to know what to pull.

So:
-compressor
-Condenser
-lines (just the rubber ones right?)

I can use the '92s evaporator and dryer etc?
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Old 06-24-2016, 03:59 PM   #6
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Metal lines too.
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Old 06-24-2016, 04:03 PM   #7
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I guess you didn't read my post. If you want to do all that, it's fine but it's not necessary
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Old 06-24-2016, 04:12 PM   #8
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I guess you didn't read my post. If you want to do all that, it's fine but it's not necessary
You answered a question he didn't ask. Yes, you can do what you suggest with less than stellar results. The early systems barely got cold with R-12. R-134 is way less efficient. A much better suggestion would be ES-12 refrigerant.
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Old 06-24-2016, 04:25 PM   #9
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Quote:
Originally Posted by 2manyturbos View Post
You answered a question he didn't ask. Yes, you can do what you suggest with less than stellar results. The early systems barely got cold with R-12. R-134 is way less efficient. A much better suggestion would be ES-12 refrigerant.


And don't forget a full flush to change the oil if you're mixing old and new components.
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Old 06-24-2016, 05:33 PM   #10
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Originally Posted by Redwood Chair View Post
And don't forget a full flush to change the oil if you're mixing old and new components.

ES-12 is a drop in replacement refrigerant for both R-12 and R-134 systems, according to the manufacturer. That makes flushing the system and changing the drier unnecessary.
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Old 06-24-2016, 05:43 PM   #11
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Quote:
Originally Posted by 2manyturbos View Post
ES-12 is a drop in replacement refrigerant for both R-12 and R-134 systems, according to the manufacturer. That makes flushing the system and changing the drier unnecessary.
I thought he was talking about mixing and matching components?
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Old 06-24-2016, 06:10 PM   #12
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OK let me jump in and say I'm not partial to using r134 and therefore specific components designed for it, I just want to have working a/c. What is the most economic (as in money, and effort) way?

Is it worth it even, to pull anything from the '93 to get me there? I'm just starting to investigate getting my inop air to work after 4 years of daily driving.

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Old 06-24-2016, 06:43 PM   #13
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I've been accumulating parts to convert my '85 to a full '93 A/C system, but using a R-12 replacement / refit kit is an easier option. I just want my A/C to be as cold as possible (thanks global warming).

Here's some links, in no particular order, that may help for either choice:

https://www.brickboard.com/FAQ/700-9...rsionPage1.htm
http://forums.turbobricks.com/showthread.php?t=222757
http://forums.turbobricks.com/showthread.php?t=210283
http://forums.turbobricks.com/showthread.php?t=162782
http://forums.turbobricks.com/showthread.php?t=222757

After 3 to 4 hours of stalking, I caught this glimpse of the rarely seen '93 heater box in its native habitat.


I think the complete heater box, the wiring harness w/ switch&relay, and the bulkhead panel were $60 from the upull&pay (save the date: Sunday Sept 11th is all-u-can-carry $56 at the Denver location).
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Old 06-25-2016, 12:27 AM   #14
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Quote:
Originally Posted by 2manyturbos View Post
You answered a question he didn't ask. Yes, you can do what you suggest with less than stellar results. The early systems barely got cold with R-12. R-134 is way less efficient. A much better suggestion would be ES-12 refrigerant.
Not sure what this Es-12 is. Never heard of it. I've been working on these systems for 20 plus years. I'm just sharing what I've done to customers cars. Aluminum Evaps with provide better cooling than the copper ones
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Old 06-25-2016, 01:35 PM   #15
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Quote:
Originally Posted by RP80242GT+T View Post
Not sure what this Es-12 is. Never heard of it. I've been working on these systems for 20 plus years. I'm just sharing what I've done to customers cars. Aluminum Evaps with provide better cooling than the copper ones

Here is a link to where you can get ES-12A. No conversion needed, colder that R-134. Cheaper than R-134. No license required. Shipped right to your door via. UPS.

http://www.autorefrigerants.com/hydr...n-refrigerants
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Old 06-25-2016, 05:57 PM   #16
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Might need to check into this
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Old 06-25-2016, 06:25 PM   #17
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Has the compressor on the 93 been recently replaced, or is it 23 years down the road?
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Old 06-25-2016, 08:51 PM   #18
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I'm also looking in to this swap. I've got a potential 1992 donor car with the factory R-12 system, which is pretty similar to the 1993 R134A system, only difference appears to be the compressor, Receiver Drier / Accumulator and the low side fill line from the evap to the accumulator. Evaporator and condenser are the same, at least according to the aftermarket. I'll be swapping the system in to a 1989 with a long dead R-12 system. I saved the working compressor from my long crushed 1994 940. I would just go ahead and get this kit too:
https://www.fcpeuro.com/products/vol...it-240-9145666
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Old 06-25-2016, 10:04 PM   #19
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Although the '91-93 240 A/C systems are similar in design, the 1993 R134A setup is unique and calls for many different part numbers. The evaporator is the same, but practically all the under hood components are different for '91-92 versus '93 only. Even the condenser fan brackets are supposedly different, although the fan itself is the same.

All the part numbers are below for both systems...

'91-92 setup:









1993 R134A setup:








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