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Originally Posted by T.A.Kirk
Where is that defined, and by who? I don't have much experience in that arena, so I'm completely in the dark about the industry standards that may already exist. What are the rules, and where is it laid out?
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SAE, NHTSA and the EPA have regulated that. To use just one example in an area I'm familiar with, the EPA on retrofitting R-134A in vehicles:
https://www.epa.gov/mvac/choosing-an...nt-cfc-12-mvac
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The label must be large enough to be easily read and must be permanent;
The background color must be unique to the refrigerant;
The label must be affixed to the system over information related to the previous refrigerant, in a location not normally replaced during vehicle repair; and
Information on the previous refrigerant that cannot be covered by the new label must be permanently rendered unreadable.
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The EPA previously has mandated that the refrigerant information must be underhood or on the cross support. The SAE J639 standard also dictates the location of such stickers - unfortunately, all the copies of J639 that I can see are behind paywalls, but you can seek it out for yourself.
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