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King of Smart Gadgetry
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If you have a leak in your A/C you probably won't be able to tell how just by looking because as soon as the R-134a hits the air it evaporates. There is also a few ounces of oil in your A/C system to lubricate the compressor, so you may see an oily spot. Most refrigerant oil is pretty light colored. The only way for sure to find your leak is to recharge your A/C again and add a can of leak detector. It is a fluorescent dye that will coat where ever it is leaking. Then they have a small flashlight that is a "black light" like the bulbs that made all those velvet picture glow back in the 70's. You can shine it around and it will glow wherever your leak is. Most of the A/C lines are buried somewhere in the Smart and are very hard to get at to check them. DCO
 
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