Reply to "Can I put new 134a into an OLD AC system"

tomcatMember

Thanks Joules...I'm trying to learn.

My understanding was that although the oils do not mix, they will not react...I assume I have very little original oil. I'll probably try to flush just to be safe.

Expansion valve. My understanding is that the expansion valve is like a tapered pin that moves in an out of an orifice to permit either more or less refrigerant to flow. That tapered needle is controlled by a capillary tube, the colder it gets, the smaller the opening. Since there is only about a 10% difference between R-12 and R-134a, the expansion valve being self-compensating really doesn't make that much difference.

Is the information not applicable to the old Pantera system? I had a 1991 BMW switched to 134a by just changing the low pressure charging valve, flushing and refilling with 134 (maybe with 10% less charge to compensate for the different pressures)...without any detrimental long term affects.

4/29/192:37 PM

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