[Jim Sims]

"A/C recharge" is likely much different than flush, evacuate, vacuum test, and refill with R-12. Having done a little of this work myself I conjecture for $120 they hooked up a gage set, maybe "sniffed" for leaks, added some refrigerant and then rechecked it with the gage set a few days later. A minimum, decent flush on a typical 911 means disconnecting two condensers with all the risk of not being able to restablish a good seal if there are flare fittings, replacing the receiver/drier, evacuating and leak checking for at least an hour (three hours is better), determining and replacing missing oil, then properly re-filling the refrigerant by watching gage pressures or weighing refrigerant going in. Cheers, Jim