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what do i need to change to go from r-12 to r-134?

what do i need to change to go from r-12 to r-134 on my 88 pontiac firebird 305 tuned port inj and what all is recommended i change?
james68inil, August 2008
Is the comppressor you have compatiable with r134 is the main thing ....otherwise there might be trouble but I have just changed the service ports on ac lines and flushed the sytem and used r 134 in them with success ..with 34 you don`t use as much as you would with r12 add 134 oil and check the orfice tube for metal ..good luck

bg, August 2008
link Click here to see other fixes for Firebird.