F 350 2WD Super Duty V8-7.3L DSL Turbo VIN F (1999)
Expansion Block/Orifice Tube: Description and Operation
A/C Evaporator Core Orifice
NOTE: The A/C evaporator core orifice should be replaced only following A/C compressor failures that produce debris in the system.
The A/C evaporator core orifice has the following characteristics:
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Is located in the A/C evaporator core inlet tube.
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Has filter screens located on the inlet and outlet ends of the tube body.
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The inlet filter screen acts as a strainer for the liquid refrigerant flowing through the A/C evaporator core orifice.
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O-rings on the A/C evaporator core orifice prevent the high-pressure liquid refrigerant from bypassing the A/C evaporator core orifice.
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Adjustment or service cannot be made to the A/C evaporator core orifice assembly. It must be replaced as a unit.
