most people know better when if comes to messing with their A/C systems.
im not sure how much experience you have with mobile ac, but if you must do it your self. go with something thats virgin r134a youll only be able to pick it up in 1lb cans since im assuming your not certified to purchase large quantities. no stop leak and minimal dye but preferably no dye. stop leak=bad. it will clog the small passages and orifices that are critical in your ac system. your compressor, condenser, evaporator core, expansion valve, they all have orifices that can be clogged by stop leak. if you have a leak. find it and just fix it. make sure not to over fill. get your self a gauge set and learn to properly fill it. and try not to purge too much into the atmosphere. think of the polar bears
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also your going to need to have the system drawn into a vacuum to charge it properly