When switching from 12 to 134a do you charge the same amount of gas back into
The system? My volare calls for 42 oz of r12.

I was going to charge it with the same amount of 134a..
Would this cause any problems?

Thanks Greg [/b]

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AC systems should be charged by temperature and pressure readings, especially if converting from R12 to 134A. Most conversions of this nature involve modified parts, different valves, etc. and can be a real hit and miss.
You cannot guaranty results by weight alone.
As a side note, what oil are you using in your conversion?

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Mattelderca
78 NYB (gone now), two S series, three old Snow Cruisers and a Doo.

Well it took about 19 oz of 134a.

I replaced the c171 compressor due to a crankshaft seal leak that would
loose a full charge of r12 after a few months.


I used ester oil and. After getting to about 20 psi. On the low and 220 psi
On the high side and forty degrees of duct temp 19 ounces worked well

Greg

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