In reply to stroker :
Does it cool with a charge in it? If it's just leaking from the body, that's likely due to shrunken orings in between the sections of the body. If that's the case, either top it up with one of the propane based refrigerants, or just put a compressor on it, don't worry about the flush.
Propane based refrigerants? WhY? Is it labeled as such on the can? Or are some cans labeled R134a actually something else (i.e counterfit) ?
Anything named "Freeze 12" or like that is generally some sort of propane/butane hydrocarbon mix.
RedTek. I did this to my rover and it worked great. Larger molecules that don’t leak as easily, and propane is an awesome refrigerant. There was a lively debate about this last time I brought it up.
Propane and chill.
My shop heat pump has Coleman refrigerant in it. It works very well.
As mentioned above, if it's leaking externally it's probably an oring/seal issue. I'd be willing to risk doing the swap with just a new dryer. I worry more about the ones that don't leak and won't make pressure. Just don't forget to add the appropriate oil.
I would want to vacuum the system down for an hour or so before charging. Any time you have a leak that drains the system to zero you almost certainly have moisture enter the system afterwards.
The $1500 quote was probably including changing out other parts as well. AC work can lose a lot of money if you're having to warranty work because of a contaminated part, etc, so a lot of shops have an "all or nothing" approach to repairing an unknown system.
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