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Faunsdale, AL | If you have a small propane torch with a copper nozzle or a piece of bare copper you can heat with the propane torch flame and let it draw some of the gas out of the system into the torch burner, when it hits the hot copper, the flame will turn green from the chlorine in the R12 reacting with the copper.
That being said, probably simpler to just hook a standard SAE set of gauges to it and check to see how its pressures are behaving as you run it. If it’s cooling and pressures are normal, it won’t matter what it has in it.
Pressures of R12 and R134a are very similar until you’re measuring at high temperatures. The few degrees difference at normal “room” temp are within the range of calibration accuracy of cheap gauges. You can look up a temperature vs pressure chart for the two refrigerants and then compare, but it’ll be easier to see a difference at condensing temps on high side of an operating system than just hooking gauges on one that’s not hot or running at the time. | |
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How to tell if tractor AC has been retrofitted?
