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Pro tip: vacuum gauge beats the soap bubble test on sealed systems every time
I used to hunt leaks with dish soap and a spray bottle until a guy at the supply house in Reno handed me his vac gauge to try on a stubborn fridge. Pulling a vacuum down to 500 microns and watching how fast it climbs tells you way more than bubbles ever will, you catch moisture and slow leaks the soap misses completely. The soap test just shows you where it already dumped its charge, the gauge shows you the problem before you waste a can of 134a. Anybody got a micron cutoff they trust on older units, or does it depend on the system?
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