RAM 3500 HD Truck 2WD L6-6.7L DSL Turbo (2008)
Expansion Block/Orifice Tube: Description and Operation
Operation
OPERATION
The fixed A/C orifice tube is used to meter the flow of liquid refrigerant into the A/C evaporator. The high-pressure liquid refrigerant from the A/C
condenser expands into a low-pressure liquid as it passes through the metering orifice and diffuser screen of the A/C orifice tube.
NOTE: A/C orifice tube size is different between gasoline and diesel engines. Be sure to use the correct A/C liquid line when replacement of the
A/C orifice tube is required.
The A/C orifice tube is not serviceable and the rear section of the A/C liquid line must be replaced if the orifice tube is found inoperative See:
Hose/Line HVAC/Description and Operation/Liquid Line .