How do you get to the Orifice tube on Peterbilt 379?

To access the orifice tube on a Peterbilt 379, first, ensure the vehicle is parked on a level surface and the engine is off. Remove the dashboard or panel covering the air conditioning components, which may require unscrewing or unclipping. The orifice tube is typically located in the liquid line of the AC system, so trace the lines from the condenser to find it, and carefully disconnect the necessary fittings to reach the tube. Always follow safety procedures and, if necessary, consult the vehicle's service manual for specific instructions.