How can you get the old refrigerant out of a 89 Toyota pickup?
If the AC has not been retrofitted, it will have R12 refrigerant in it, which is illegal to release into the air. Most auto shops used to have a R12 recycling/recovery system, but most will not, because R12 is obsolete and VERY expensive. The shops will remove the freon from the low & high side schrader valves (like tire inflation valves). Once the freon is evacuated, they pull the system down with a vacuum. This makes it easy to introduce the new freon, which is R-134a (self charging lines are widely available for $10 & about $9 a can for freon. each car will have the recommended amount of freon, usually on a sticker on the accumilator.
If it is out of refrigerant but lost it slowly enough that you think it will hold more, the easiest is to buy a conversion kit at an auto store to change from the older refrigerat to the newer weight. The kits have instructions. It's a matter of empting the old (which requires a dealer's equipment to do it legally and not damage the ozone). Then putting on new caps. Then refilling it with the…
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The original freon (refrigerant) in the 1989 Dodge Dynasty's was R12. The amount of R12 it was supposed to use was 32 ounces. R12 freon is no longer available because of environmental concerns. Most such systems were converted to use R134 or R134A refrigerant, which is much less efficient in terms of cooling. Another type of refrigerant that is still available (which is better than R134) is called Envirosafe.