Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Legacy 2000-2003 Approved Subaru Legacy 2000 2000 Service Manual MECHANISM AND FUNCTION SECTION Air Conditioning System MSA5TCD00L18244

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MSA5TCD00L18244


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                                      MECHANISM AND FUNCTION                             [M6A0]    4-7
                                                                                           6. Evaporator


6. Evaporator
A: MECHANISM
An airstream produced by a blower passes through the cooling fins and tubes. This air is warmer
than the refrigerant and gives up its heat to the fins, tubes and then to the refrigerant itself. As the
low pressure refrigerant moves through the evaporator, heat given up by the air passing through
the evaporator causes the refrigerant to begin to boil. By the time the refrigerant has passed
through the evaporator, it becomes a vapor. As the heat is absorbed by the boiling refrigerant,
the fins and tubes turn cold and in turn cool the air passing over them. Moisture contained in the
air condenses to water drops as it passes around the cooling tubes and fins of the evaporator.
Water and dirt are then discharged outside the vehicle through the drain hose.
The evaporator is a laminated type and consists of thin, rectangular aluminum plates arranged
in many layers and fins that are attached between them. The operation of the evaporator is as
follows:
Misty refrigerant (very close to liquid form) from the expansion valve at a low pressure, enters the
lower tube of the evaporator, where it soaks up heat from the compartment. The refrigerant boils
and vaporizes quickly due to the rapid heat exchange. Then the refrigerant is pushed upward by
the force of the bubble generated during the exchange and passes evaporating into the upper
tube. When it reaches to upper tank, the refrigerant is in a thoroughly vaporized form.
The evaporator has a single tank, and its surface has been given a multiple treatment.
D Rustproof treatment
D Waterproof treatment
D Moldproof treatment




                                                                                               B4H1511A

              (1) From receiver drier
              (2) To compressor
              (3) Misty refrigerant
              (4) Vapor
              (5) Expansion valve




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