134A refrigerant was offered as an option as early as 1992(start of the ninth gen F series). I thought it was likely standard by 95 or 96 year models.
If the truck in question was factory R12 then it needs to be flushed out for conversion to 134A. Original equipment for about all manufacturers 134A systems is PAG oil in whichever viscosity.
Something to take note of is that 134A will work ok with PAG or ester oil...not the old R12 refrigerant oil(some sort of mineral oil I think)...R12 is not compatible with PAG oil..however it will work with ester oil.
Moral of the story is that on an R12 to R134A conversion flush them as good as possible with AC flush and use whichever PAG the compressor model needs. If doing a simple 'red-neck' conversion R12 to R134A and you are not sure you have all the old R12 oil flushed out..use ester refrigerant oil. If you're re-using an old R12 compressor be sure and remove it and drain as much oil from it as possible...flush it out if possible..and refill with some of whichever 134A oil you are going to use in the system.
Apparently many R12 equipped vehicles from the 1990's must have came from the factory with ester refrigerant oil in them...as many many folks just filled them up with R134A and got on with it(and the compressors didn't seize-up!!)
Just remember that the old R12 oil will not work with 134A....and that R12 will not work with PAG oil....ester oil will work with either one.
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