Where is the expansion valve on an 05 peterbilt 379?

On a 2005 Peterbilt 379, the expansion valve is typically located in the HVAC system, specifically within the air conditioning unit or evaporator assembly. It is usually found near the evaporator core, which is situated behind the dashboard or under the hood, depending on the configuration of the truck's air conditioning system. For precise location and access, it's advisable to consult the vehicle's service manual or schematics.