Compression Ignition Addict
Join Date: May 2011
Location: DFW, Texas
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Yeah stop leak is the worst thing you can put into an A/C system. You can go to most local shops and get a recharge done from anywhere from $100 - $250 (as long as it's 134a and you don't have any problems with your system) depending if you just need a top off or a full evac & refill.
Lots of people end up causing more damage and or problems with their A/C systems by doing the DIY kits as they typically:
1) Turn the can upside down instead of holding it upright causing the A/C liquid instead of the gas to enter the low side of the compressor system or heat up their freon can to try and speed the process up (a "normal" recharge from a freon bottle kit takes 10+ minutes)
2) Overfill their system with freon (too much or too little and your A/C won't work) Most modern vehicles take around 2 lbs of refrigerant (more or less depending on the sytem) and rarely will take more than 2 cans of 134a unless you have a serious leak
3) Mix and match R-12 and R-134a, this is really bad joo joo and is more prevelent in <97 model year vehicles (although some 2000+ vehicles were still manufacturered with R-12, there will be a sticker no your evap, compressor or near your A/C system telling you what your system is charged with)
4) Put "stop leak" chemicals in their systems that don't actually have a leak causing intermittent problems with the condenser, compressor, evap system, etc
5) Severely scew their refrigerant / oil ratio causing excessing wear or excessive heat within their system leading to failures, plugs, etc
In general, if you're having A/C issues, take it somewhere and have it evac'd and refilled, if needed or just a straight out refill. It'll not only make your A/C system run more efficiently but it'll also save your compressor and thousands in repairs down the road.