The main problem is that the oils are incompatible. When people started converting from R-12 to R-134a, the conventional wisdom was that the system needed to be evacuated and flushed before switching to R-134a. However, it turned out that the old oil tends to just separate out and not cause much trouble. So it became common to just evacuate and refill using R-134a. Also, you can get ester oil that is compatible with the old oil.
With an old car, the a/c is probably on its last legs, anyway. If you're going to do a conversion, you should probably go the whole hog: replace the dryer, flush out the system and probably replace the compressor, too. Then it's a matter of evacuating and filling with R-134a. If this sounds like too much money, then leave it alone.
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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