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R-12 Alternative -
Hey McLovin - I've used "Key Board Duster" or "Dust Off" for almost 10 years in the Texas heat with great results. It's formulated to be sprayed into the open air, environmentally friendly, is compatible with all the original R-12 A/C system components and works with mineral oil. The best part is that it's extremely close to being equitable in quantity vs cooling performance with R-12 and cost about $3 for a 10 oz can. The chemical name for R-12 is dichlorodifluoromethane - the active ingredient to look for listed on the can of "Key Board Duster" or "Dust Off" is "difluoroethane". Bring your glasses because of a CIA government conspiracy, the print on the can is very tiny....
Just pick yourself up one of the smaller circular hand held "squeeze to puncture" freon installation tools. The diameter of the "Dust Off" can is slightly smaller than the R-12 can, so may need to add a rubber spacer to the back side of the can. Once you're happy with the evacuation of your A/C system - puncture the can of "Dust Off" at the bottom so you're installing it as a liquid, put in a couple of cans, begin checking your pressures and vent temps.
Works well in Texas - but use your own judgement -
Good Luck - Michael
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1984 928S - "Miss Purdy"
1987 911SC - "Frau Helga"
1986 930 - "Well Hung"
1975 911 Targa "Blue"
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