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For me the number one tool in reducing the comebacks I experience when working on automotive AC is the Freon leak detector. This tool provides a signal when it sniffs or detects refrigerant in the air. I find the Robin air tool very reliable. It provides an audible beeping sound when it see's this refrigerant.
Eventually, it was determined that the refrigerant used for decades in automotive AC, known as R-12, CFC-12, or its brand name Freon, was damaging the ozone layer (it's a chlorofluorocarbon). It was banned from being manufactured in the United States and an alternative, called R-134a or HFC-134a, was required for all cars manufactured after 1996. Now, any car older than that needs to be retrofitted with a new system that can use the newer, safer .
One issue with automotive AC is the Freon itself. It is an invisible gas that has no color or odor. Add to this fact the most modern systems only use about 24 ounces of Freon and even a small leak can cause the AC to blow warm air over short period of time.
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