F 150 4WD Pickup V8-5.4L CNG VIN M (2001)
Evaporator Core: Description and Operation
NOTE: Whenever an A/C evaporator core is replaced, also replace the suction accumulator.
The A/C evaporator core is the plate/fin type with a unique refrigerant flow path.
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A mixture of refrigerant and oil enters the bottom of the A/C evaporator core through the A/C evaporator core inlet tube and is routed so it flows
through the partitioned first three plate/fin sections.
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The next four plate/fin sections are partitioned to force the refrigerant to flow toward the other end of the A/C evaporator core.
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Refrigerant then continues over to the remaining five plate/fin sections and then moves out of the A/C evaporator core through the A/C evaporator
core outlet tube.
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This S-pass flow pattern accelerates the flow of the refrigerant and the oil through the A/C evaporator core.
