quote:There is no way available to the average A/C shop for them to tell what gas is in your system.
If I can manage to have one of these on my garage shelf, I imagine an average A/C shop could have one.
A standard R/R/R unit has only one recovery tank. No shop will knowingly contaminate that tank with any of the R-12 substitutes on the market.
Yes, the substitutes 'work'. But innocently mention you've added them to your system, and the shop will likely decline to work on it.
Larry