No, R134b and R134a are not the same refrigerant, and R134b is not a direct drop-in replacement for R134a. While both are similar in terms of their chemical structure, they have different properties and performance characteristics. Using R134b in a system designed for R134a may lead to inefficiencies or damage. Always consult the manufacturer's specifications before making any refrigerant substitutions.
No, there is retrofitting required.
It's only Freon if it was manufactured by DuPont, but to the important things... Your 89 would have had an R12 system from the factory. You can't use R134a in an R12 system unless you do at least a partial retrofit (evacuate all the R12 and compressor oil, replace the orifice tube, replace the accumulator, replace the hose connections, add PAG oil and R134a).
newer vehicles, such as a 99 jeep, all use 134-A refrigerant.
All cars manufactured after 1993 were required to use R134a refrigerant.
R134a . All vehicles after 94 went from R12 to R134a
Chevy switched from R12 to R134a for the model year 1994. Your truck should be R134a.
It uses R134a.It uses R134a.
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