Expansion (Orifice) Tube Description; Evaporator Description; Condenser Description; Accumulator Description - GMC Chevrolet Camaro 1998 Service Manual

1-120 HVAC System - Manual
Expansion (Orifice) Tube Description
Legend
(1) Short Screen (Outlet)
(2) 0-Ring
(3) Long Screen (Inlet)
The plastic expansion (orifice) tube includes the
following components:
• A mesh screen
• An orifice
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The expansion (orifice) tube is located in the
evaporator inlet pipe at the liquid line connection. The
tube restricts the high pressure liquid refrigerant in
the liquid line. The tube meters the refrigerant flow to
the evaporator as a low pressure liquid.
The expansion tube and the orifice have filter screens.
The filter screens which protect the tube from
contamination on both the inlet and the outlet sides.
The refrigerant in the system flows from the high
pressure side of the tube to the low pressure
side when the following conditions exist:
• The engine is OFF.
• The A/C is running.
The refrigerant will flow until the pressure is equalized.
You may hear a faint hissing sound for 30-60 seconds.
This sound is normal.
Evaporator Description
The evaporator cools and dehumidifies air before the
air enters the passenger compartment. The following
events occur in the evaporator:
1 . Low-pressure, low temperature liquid/vapor
refrigerant enters the evaporator.
2. The refrigerant flows through the evaporator's
tubing.
HVAC
3. The refrigerant evaporates.
4. The refrigerant exits the evaporator as
low-pressure, low temperature, mostly vapor
refrigerant.
5. As the refrigerant evaporates, the refrigerant
absorbs heat from the air flowing over the
evaporator.
As the process of heat loss from the air to the
evaporator core is taking place, any moisture
(humidity) in the air condenses on the outside surface
of the evaporator core and the moisture drains off
as water.
Condenser Description
The condenser receives high pressure, high
temperature refrigerant vapor from the A/C
compressor. The condenser is made up of aluminum
tubing and cooling fins which allow rapid heat
transfer away from the high-pressure, high temperature
refrigerant vapor. The cooling fins cause the high
pressure, high temperature refrigerant vapor to
condense into a high-pressure, medium temperature
liquid.
Accumulator Description
1
8
Legend
(1) Refrigerant Vapor Inlet
(2) Inlet
(3) Baffle
(4) Internal Tube
(5) Desiccant Bag
(6) Filter
2
(7) Oil Bleed Hole Location-In the Tube
(8) Outlet
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