 We had a vehicle in just last week that the guy tried putting four cans of that in an old Ford Excursion with a dual AC system to fix the leak. It ended up all that was wrong with it was there was a line rodded going to the back of the unit, the back rear AC unit. Because he put four cans of that sealer in there, we ended up replacing two evaporators, an expansion valve, an orifice tube,