Affirmative. That's a NO GO on the mixing of refrigerants or their corresponding oils. R-12 uses a mineral based oil and R-134a uses PAG oil (polyalkylene glycol). I've seen it done in some commercial refrigeration applications. Let's just say the results have been costly.
The problem is that the hoses most likely used on your cars original R-12 system will not be compatible with R134a...and most likely neither will the seals in the compressor, the rating on the high pressure cutout, or the expansion valve.
Sorry Old, but there is no good solution to this one unless you've got a little R-12 laying around...
This post was edited by BillyinStoughton at 15:09:22 07/24/12.
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