R134 .... IS freon.
R134
R134
THERE IS NO FREON IN A 98 IT IS R134
They should never be mixed.
1993-95 for most.
With the A/C running Full-Blast @ Lowest Temp., You adjust R134 gauge according to Ambient Temp., & then add required amount of R134 until the black dial falls into the center of the Red 'Ambient Temp Zone'. Let engine run for 20 to 40 minutes with A/C remaining on Full Blast.
R134
R134
R134
Should be R134 if it is 1993 or newer if older should be converted to R134
It takes R134-A.