Where is the orifice tube on 1999 GMC safari?

The orifice tube on a 1999 GMC Safari is located in the high-pressure line of the air conditioning system. To find it, trace the aluminum line that runs from the condenser to the evaporator. The orifice tube is typically found near the evaporator, which is located inside the dashboard, requiring some disassembly to access. Make sure to discharge the AC system properly before attempting any repairs.