my car had no A/C in it when I got it. Add a can of R134 and a can of oil and I was good to go but this summer the A/C was gone again. So this time my mechanic did a check on the system and said that there is a lieak somewhere but he doesn't know where. He said if it was behind the dash it would be expensive. So he got me can of R134 Stop Leak. He siad it isn't the best thing but it will stop the leak for the time being. and 2 cans of R134 and one can of oil and she is ice cold baby. Retards like a mutha****er though. Turn my A/C on feels like I shifted into another gear;o)