A/C from R/12 to R-134 change Expansion Valve
#1
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Do you need to change the Expansion Valve when converting from R-12 to R-134. My friend is getting his changed now and the shop is saying it calls for the same expansion valve, is that true?
#2
Race Car
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You don't HAVE to, but I would do it. It's <$50, they can fail and replacing them requires an evacuation of the system. And you will be disconnecting it anyway to replace the o-rings. They are replacing all the o-rings... right?
Dan
'91 928GT S/C
475hp/460lb.ft
Dan
'91 928GT S/C
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#3
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Of course not, pay me now or pay me later, do they ever listen!
I gave up working on this car because of this type of stuff so when it leaks in a few weeks I'll say told you so.
I gave up working on this car because of this type of stuff so when it leaks in a few weeks I'll say told you so.
#4
Race Car
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Ha, I bet there will be no flushing of the mineral oil either.
Just another +1 to the people who think an R134A conversion sucks, not knowing or admitting to themselves it's because they didn't have it done right.
Dan
'91 928GT S/C
475hp/460lb.ft
Just another +1 to the people who think an R134A conversion sucks, not knowing or admitting to themselves it's because they didn't have it done right.
Dan
'91 928GT S/C
![EEK!](https://rennlist.com/forums/images/smilies/eek.gif)
#6
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To get my converted system to work perfectly I replaced the compressor (rebuilt Porsche), the main a/c hoses, the rxr/drier and the expansion valve. All associated O-rings were replaced with the green ones, system was flushed and Ester oil added.
#7
Official Bay Area Patriot
Fuse 24 Assassin
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Fuse 24 Assassin
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I've heard this is a bad idea. On mine, the compressor, receiver/dryer, and expansion valve are all shot to sh*t. Would it still be worth keeping to R-12 or do I have enough components to replace there to goto R134?
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#8
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He just called the shop put in 2.5 Lbs of 134 on an 82 this should be 1050 grams less 20% or about 1 lb 13 oz is this correct. Can't wait till the system blows up!
#9
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Dan
'91 928GT S/C
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#10
Fleet of Foot
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Yes, I will catch some grief from the pro 134 crowd.
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#11
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Can we say overfill? Change the expansion valve and don't convert to 134
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#12
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TOOOO LATE: He came over for me to look at it, the high pressure valve is leaking, so maybe it will be down to the correct pressure in a while. He never listens to me, it has a one year warranty for $775.00 includes rebuilt compressor, he will need it. The window on the R/D still had his sticker over it I asked if you could see bubbles he said no, humm wonder why. I feel bad I did not do this job myself, but I have done enough on this car and don't want to live with it the rest of my life.
#13
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If the expansion valve works, there is no need to replace it. It works by temperature, not refrigerant type. Hopefully the comp shaft seal isnt leaking now. Cant use the r/d window with 134, will always look cloudy. That place is killing his car.
#14
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I know, from what I have read if you can see a few bubbles after the conversion its correctly filled. Either way, the R/D valve is leaking and will need to be repaired so by the time it leaks out he will be ready to get the correct charge in it.
#15
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I have converted every 928, pickem up truck, and even the freezer in the boat to 134a - and they will freeze you out!
PROPERLY done - they work great. I have yet to change the TEV.
PROPERLY done - they work great. I have yet to change the TEV.