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Actually, "freon" is also slang. I worked around HVAC engineers for years, and they referred to the refrigerant as "freon" "coolant" and other names. R134a is not freon, if you want to get picky about it.
I was not talking about engine coolant. I think that's clear in my post.
Also, I would like to know how you diagnosed the low R134a level? Simply by the high-side pressure reading? Do you know how the variable pressure systems work? It is not an acurate indicator of R134 level unless you know other factors.
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