2008 Toyota Camry LE V6
This is generic, but the low side is the larger of the two lines, the line that goes through FROM the evaporator, the gas flowing to the compressor. The smaller one goes from compressor to condenser, in front of radiator. In my Corolla it's even marked "LOW"
click the images to enlarge them. Now this is Camry, very similar to Avalon,. the Avalon being a bit higher-end Toyota
One more. See that it goes through firewall? that is to go to evap. Remember, general rule, bigger line, low. Smaller high. I don't know what you plan to do, but please do not release R134a gas in to the air we breathe. it's highly illegal and just plain wrong. Good luck with your repair
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