As previously posted numerous times, most cheap non-freon replaxcements contain PROPANE and many are illegal to use in some states. Check the list of ingredients, then check with your local AC experts to see if your area even allows the stuff. Lots of gasses produce a refrigeration effect; few are legal or desirable in mobile units. Carbon disulfide is used in commercial refrigerator systems for instance, but in the event of a wreck, you'd be hard pressed to stay within 50 fert of the car... unless you're really fond of rotten eggs.
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