Kia 2004.5 Spectra Service Technical Training page 227

2004.5 Spectra Technology
EXPANSION VALVE
EVAPORATOR
Heating, Ventilation, & Air Conditioning (HVAC)
When the PCM/ECM sets a "low" speed for both
radiator and condenser fans, the control coil of the
radiator fan relay is grounded, closing the NO switch
and providing B+ to both the radiator and condenser
fan motors through both the radiator fan relay and the
condenser fan relay #2, with a control coil that is not
energized. The relays wire the two fans in series,
which cause both fans to operate at low speed due to
higher circuit resistance.
When the PCM/ECM determines the need for "high"
speed, the control coil of condenser fan #1 is also
grounded, closing the NO switch and supplying B+ to
the condenser fan motor. Also, condenser fan relay
#2 control coil is grounded and energized, which
transfers the switch contacts to provide a ground to
the radiator fan motor. Both fan motors are now in
parallel causing them to operate at high speed to cool
the A/C condenser and coolant radiator.
The expansion valve is a block style and is located
behind the engine on the bulkhead. It contains the
capillary temperature sensor within the block to meter
high pressure liquid refrigerant into the evaporator as
low pressure liquid refrigerant (atomized) to absorb
heat through the evaporator fins.
The evaporator, located in the air distribution box,
evaporates the atomized refrigerant into a gas while
exchanging the heat from the air flowing (by the
blower motor fan) across its fins.
N N o o t t e e : : I I f f l l e e a a k k i i s s s s u u s s p p e e c c t t e e d d , , i i n n s s e e r r t t A A / / C C l l e e a a k k
d d e e t t e e c c t t o o r r a a t t t t h h e e e e v v a a p p o o r r a a t t o o r r d d r r a a i i n n h h o o l l e e . .
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