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Flush & Clean
In my case the compressor had been off since I bought the Bronco so I didn't have any old R12 to get rid of. From what I'm told the number one problem with this conversion is that R12 and R134a don't like each other. The oils used don't like each other and the residue left behind by the R12 will sabotage your work. The first step then is to get the whole system completely cleaned of all R12 gas, oil, and residue. Of course, it's against the law to vent R12 into the atmosphere. The local A/C shop will, for a small charge, hook up to your system with their recovery equipment and gladly suck you dry (their speciality). After getting rid of the R12, completely disassemble the system. Remove the hoses, old accumulator/dryer, evaporator and condensor coils and the compressor. You will find quite a bit of oil in the system. Most of it ends up in the compressor and the evaporator. Drain these first. Get some A/C system flush & clean (+/- $30.00 for a gal.) and use about half a gallon to completely flush out all the components. I used shop air to blow everything out but make sure you've got a good dryer because any moisture in the system will screw things up. I spent a good 2 or 3 hours on the cleaning phase.
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