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There is Hot Shot... not "Hot Shot Freon" - "Freon" is a trademark of DuPont for a line of CFC and HFC refrigerants, whereas "Hot Shot" is a trademark of ICOR International for their R414b refrigerant. But yes, "Hot Shot" refrigerant is R414b.
The manufacturers claim that R414B refrigerant (Freon is a registered trademark of Dupont, and it's only actually Freon is manufactured by Dupont) can be used as a replacement without modification and with the same PAG compressor oil. While, personally, I remain a bit skeptical of this claim, a look at the operating pressures of 414b vs. 134a gives no indication that a 134a system wouldn't be able to handle 414b. However, you cannot blend the two - you would have to have the R134a evacuated and recovered out of your system, then put in the R414b.
30 lb
Define "older model". Up to the early 90s, they used R-12/CFC-12. Good luck trying to get that anymore. R414B is the recommended replacement for R12 systems.
No, you can not purchase R414B (legally) without being EPA Cert. Secondly, yes it will work in a pre 1995 car.
The name.
Same thing
You can't. You have to be Section 608 certified and licensed to buy CFC12 (R12) in any quantity. Your best bet is to either convert it to R134a or R414b.
A closed system would be full of freon without any leaks and a opened system would have no freon or has leaks...........
There is very little difference in performance between R-12 and R-143A Freon oil. R-12 oil is more damaging to the environment while R-134A is less harmful.
Is r-22 Freon compatible with r-134a freon?
Depends on how extensive a conversion you want to do. If you want to a complete conversion and replace just about everything, the cost will be in the thousands. For considerably less, you can replace the refrigerant oil, replace the hose fittings, and replace the metering device. Another alternative is to switch to R414b, which is claimed to be able to replace (read: replace, not be blended with) R12 without a need for changing oil or components.