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Old 03-25-2015, 08:18 AM   #1 (permalink)
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Default A/C Charging

Any info on how to charge the a/c system? Mine works good but its a bit old and is not as cold as I want it to be. I know it won't be super cold but I also know it can be cooler. Please let me know if this is something I can do myself or if I should take it in to have done. Thanks
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Old 03-25-2015, 11:07 AM   #2 (permalink)
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I'm pretty sure yours is R12 which means when you take it in for a charge the AC shop will probably explain why you should convert to 134a like everyone else on the planet. But you should not IMO, 134a is designed to work in larger systems and is less efficient in a weenie system like the Samurai. I think it has something to do with needing a considerably larger condenser or evaporator, cant recall exactly.

I have done or had done 5-6 non-Samurai systems from 12 to 134 and only one of them actually worked as it should when ambient temps rose over 90. There is a lot of information on 12 vs 134 and probably worth a read. The easiest way to properly handle an R12 system would be to score a can or two of R12 from ebay or somewhere because the AC guy will probably want an absurdly high price for it. If you have to add refrigerant to it then there is likely a leak, maybe a small leak and some folks would rather just ad some every year than tear it all down and repair. R12 is harder to get and more expensive so you might consider that to.

The performance deficit may be related to other issues. Maybe it already has 134a in it, in which case I would convert back to 12 but I believe when a conversion is done there should be a sticker somewhere on the system to indicate that. Make sure the condenser fan is up to par, that will definitely cripple an AC system. I threw an aftermarket 10" radiator fan on mine as the OEM was borderline anemic.
Keep in mind that the AC systems do not blow through the heater core and only through the dash vents. I'm going to use 152 in mine but I cant officially recommend this. I know a few RX7 and MB guys that swear by it and other warn of the danger.

I dont have any links left but its very much worth a read. It would be great if you have a friend with a manifold set and the knowledge to use it, you would save $$ that way. Youtube is full of instructional videos on AC system maintainance so if your comfortable doing it yourself you might be able to rent gauges for an afternoon or something. Keep us posted on how it goes. I converted mine to AC and have not charged it yet. It probably wont get super cold, especially in a ragtop, I guess tintops can keep fairly cool if the AC is up to par.
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Old 03-25-2015, 02:05 PM   #3 (permalink)
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Yes, Mine is a tiptop and holds heat and cold air(YES they both work) I am almost 1000% sure its the R12system and will look into getting some. I know I can find some and I will keep you posted on this. Thank you for taking the time to answer my question
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Old 03-25-2015, 02:59 PM   #4 (permalink)
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No problem, I think 134 came about in the mid-late 90s. I had to do a lot of research as mine came without AC, I got the system from Mikoda industries and installed it myself. Very tight with the power steering to. Mine is ragtop so I dont expect much when I do get it charged and going.

Good luck with it, it promises to be a pretty toasty summer.
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