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Re: Rear Aux Unit - Bad expansion valve?
I wouldn't use a gas like propane, at least not without some careful research. There's too much that can go wrong. The pros use Nitrogen gas because it is cheap and mostly inert in the system. The only thing better would be something like Helium or Argon, since they are totally non-reactive.
Also, a can of R-134a can be purchased for less than $10 at Walmart. Less than a can is all that is needed for leak checking.
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