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Swapping r12 hoses for r134a barrier hoses.

Dino69 on Wed July 11, 2012 8:14 AM User is offline

Year: 1969
Make: Dodge
Model: Charger
Engine Size: 440 ci
Refrigerant Type: R12 to R134a

Hi all,

I have a '69 Dodge Charger that originally had a 318 small block and now has a 440 big block. The intake line is original, the compressor and discharge line were on the big block. I thought about trying to find someone to recharge it with R12 but thought better and decided to cut off the hoses and fittings and buy barrier hoses. I am hoping someone in my area can do the crimping for me as I don't want to spend a fortune on the tools. I'm also looking for a parallel flow condenser. Am I correct in assuming that the intake line is #6 and the discharge line is #8? I know that's the condenser size fittings. Is this the size of the actual barrier hoses as well because I would like to buy the hoses and fittings here but I see it goes up to #12.
What exactly do I need to change on my old RV2 compressor? I know I need to drain the old oil and change the o rings to the green type and then put in ester or pag oil. What about the fittings? can I buy a simple conversion kit for it? I also have a new drier and will also buy a new expansion valve. I hope that's all I need.


Edited: Wed July 11, 2012 at 3:58 PM by Dino69

JJM on Wed July 11, 2012 9:15 PM User is offline

You could check with the site sponsor or give them a call at (602) 233-0090 on the hoses... they may be able to fabricate replacements if you send them in. Hoses should be changed anyway, R-12 or R-134a because of age.

I strongly urge keeping this vehicle R-12, especially if your RV2 has an EPR valve, which might not be adjustable for R-12. If you are going to convert, you need to do it right, so you need to flush. I suggest POE over PAG for the oil, since POE can better tolerate any residual chlorine left in the system. Get quality fittings from the site sponsor, they're not expensive. When you replace the dryer, this is the one area you don't want NOS; get a recently manufactured dryer with XH7 or XH9 desiccant compatible with R-134a. Green HBNR O-rings are good, R-12 or R-134a. You might also need a higher capacity paralell flow condenser, if high side pressures can't be brought into line.

Keep in mind, though, that maximum cooling cannot be obtained if the EPR valve is cutting out at R-12 pressures. If your RV2 doesn't have an EPR, and uses a thermostatic switch for evaporator freeze control, then you're good.


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Edited: Wed July 11, 2012 at 9:15 PM by JJM

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