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2010 DTS
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The "adjustable knobs" I suspect are the A/C port service caps. Keep them tight or freon can seep out as the R134a molecules are very very small. There are no adjustments. The hissing you hear is the system equalizing pressure when shut down and is normal.

The orifice tube is inside the aluminum A/C line along the firewall, much like the thermostat is inside the coolant hose and is not accessable without opening the system up or adjustable.
 
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