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Converting to R134?


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7 replies to this topic

#1 RallyKeith

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Posted 21 October 2003 - 07:44 AM

Has anybody done it recently that can tell me what I would need to safely run R134 in my 88RX? Some cars it's just a matter of changing, and some cars require lots of seals to be replaced, and sometimes the compressor. I may need to replace a line and at that point I'll have no choice but to convert.

Thanks,
Keith

#2 calebz

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Posted 21 October 2003 - 07:52 AM

Its just a few seals.. compressor stays.. the biggest thing is to have the lines completeley evacuated.. r12 and r134a don't play well together

.. You can get a conversion kit at autozone for 35.99

#3 rallyruss

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Posted 21 October 2003 - 12:19 PM

makesure you dont have any leaks first. you should change the acumilator at the same time. yeah new seals too. use the pag oil with a 134a conversion. the stuf with dye is good to use but dont touch the stuff with sealant in it. real bad for a/c systems.

#4 88rxsedan

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Posted 21 October 2003 - 04:02 PM

i thought you were suposed to use "ester" oil when converting..
thats what i always use when i do a conversion...
heres what i did on all my cars
85 300zx
88 F-150
90 Escort
92 isuzu pickup
87 impulse

get the 134a fitting adapters and a vacumn pump.
pull vacumn - check for leaks with gauges...
if it leaks, FIX IT... Now, with the system UNDER VACUMN..
go ahead and shoot the oil in, then - about a can of freon..
start the car - turn on the ac, and HOPEFULLY - the compressor will come on, if it dosent, give it some more freon - keep adding it until your at the specified level (pressure ok) and for gods sake MAKE SURE YOUR NOT ON THE HOT SIDE.... if the compresser wont kick, be sure the pressure switch is hooked up, and if you have to jump it, go ahead, but only long enough to get it to stay on by itself..

ive never changed any o-rings, seals, dryers ect.. just a straight up direct conversion with ester oil, and not even flushing the system, unless its been open. ... seems quite compatable considering that they ALL STILL WORK, and i did 3 two summers ago, and the rest last summer.. Im in south texas, and you know how hot it gets here.. maybe ive been lucky, but ****... if you mess yours up dont cry to me ...

#5 moosens

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Posted 21 October 2003 - 05:28 PM

Keith,you coming to Pine Barrens this time?

Change the seals when converting.Might be a good idea to get a used compressor and change out on a bench.I think you may need to change seals under the dash too....not sure,but I know Aldo did on his Brat.

#6 RallyKeith

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Posted 22 October 2003 - 09:07 AM

Here's the story. My RX has the setup where the alternator is sandwiched between the power steering pump and the AC compressor. I'd love to do the XT-6 alternator swap, but it won't fit. I've got everything pulled apart to rebuild the motor, and when you bolt the XT-6 alternator to the bracket there is no room for adjustment. So, I was thinking I could find a car in yard with the alternator to the out side and do a swap. Only problem is that means I'd need to swap one of the hoses to the AC Compressor. Since my R12 system is actually working perfect that would really suck. Maybe I should just have the regular alternator "re-wired" for more power.

Keith.

PS, still not 100% certian, but it looks like I'm coming for a little while if nothing else. Also depends on if some of my buddies are intersted in meeting me in Atlantic City that night for some Poker! (Poker is now my third favorite thing behind Racing and Subarus!)

#7 DerFahrer

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Posted 22 October 2003 - 02:12 PM

Cake. I have put everything back together on my Legacy, I just haven't found anyone to pull a vacuum on the system yet :banghead:

Relieve pressure the safe way by pressing the fittings on the hoses in just like a tire valve. It will take a while, but it's the safest way. Take the compressor out, and then drain all the old oil out, get as much as possible out. Since your system is open, you need to replace your drier. So when you're at the auto parts store, get some R134 refrigerant, R134 fittings, "esther" oil (yes you want this, because it is compatible with the remaining oil left in your compressor, you CAN'T get every last drop out), and a drier. Find out the capacities for how much oil and refrigerant you put in for your car, I don't know them for 80's Scoobs. Fill them up appropriately, put everything back together, find someone to pull a vacuum on the system so you can charge it, and walaa! You have R134 a/c...

#8 88rxsedan

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Posted 22 October 2003 - 02:16 PM

Originally posted by subyluvr2212
Cake. I have put everything back together on my Legacy, I just haven't found anyone to pull a vacuum on the system yet :banghead:

Relieve pressure the safe way by pressing the fittings on the hoses in just like a tire valve. It will take a while, but it's the safest way. Take the compressor out, and then drain all the old oil out, get as much as possible out. Since your system is open, you need to replace your drier. So when you're at the auto parts store, get some R134 refrigerant, R134 fittings, "esther" oil (yes you want this, because it is compatible with the remaining oil left in your compressor, you CAN'T get every last drop out), and a drier. Find out the capacities for how much oil and refrigerant you put in for your car, I don't know them for 80's Scoobs. Fill them up appropriately, put everything back together, find someone to pull a vacuum on the system so you can charge it, and walaa! You have R134 a/c...


you can make a vacumn pump out of an old busted rump roast refridgerator




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