Model: Town Car
Engine Size: 281ci
Refrigerant Type: R134a (now)
Country of Origin: United States
As an air conditioning noob I would like to know why it appears some people say to use less R134a in a system that was originally charged with R12?
R134a has a higher operating pressure. Refrigerant needs to be converted from a gas to a liquid. The higher the high side pressure the harder it is to do this. Options are to get a more efficient condenser or some will undercharge the system. I don't suggest undercharging as you lose the ability to carry the oil back to the compressor.
How did that work out for you? Be aware that too much R134a charge can result in too high of condenser pressures.
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