Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 592
AC-27
Power Transistor (Auto A/C Model)
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
10.Power Transistor (Auto A/C
Model)
A: REMOVAL
1) Remove the instrument panel lower. <Ref. to EI-
54, INSTRUMENT PANEL LOWER, REMOVAL,
2) Disconnect the power transistor connector.
3) Remove the screws and remove the power tran-
sistor.
B: INSTALLATION
Install each part in the reverse order of removal.
AC-01806
AC-28
Blower Resistor (Manual A/C Model)
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
11.Blower Resistor (Manual A/C
Model)
A: REMOVAL
1) Remove the instrument panel lower. <Ref. to EI-
54, INSTRUMENT PANEL LOWER, REMOVAL,
2) Disconnect the blower resistor connector.
3) Remove the screw and remove the blower resis-
tor.
B: INSTALLATION
Install each part in the reverse order of removal.
C: INSPECTION
1) Disconnect the blower resistor connector.
2) Check the resistance between blower resistor
terminals.
3) Replace the blower resistor if the inspection re-
sult is not within the standard value.
Terminal No.
Specification
4 and 3
Approx. 0.43 Ω
4 and 2
Approx. 1.03 Ω
4 and 1
Approx. 3.0 Ω
AC-01777
(2)
(4)
(1)
(3)
AC-01730
AC-29
Heater Core
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
12.Heater Core
A: REMOVAL
1) Remove the heater and cooling unit. <Ref. to
AC-36, REMOVAL, Heater and Cooling Unit.>
2) Remove the screw and detach the heater pipe
cover.
3) Remove the screw and detach the clamp.
4) Remove the pipe clamp and pipe.
5) Remove the heater core cover.
6) Remove the heater core.
B: INSTALLATION
CAUTION:
Replace O-rings and pipe clamps with new
parts and install securely.
1) Install each part in the reverse order of removal.
2) Fill engine coolant.
• Other than STI model: <Ref. to CO(w/o STI)-13,
FILLING OF ENGINE COOLANT, REPLACE-
• STI model: <Ref. to CO(STI)-13, FILLING OF
ENGINE COOLANT, REPLACEMENT, Engine
3) Charge refrigerant. <Ref. to AC-20, PROCE-
DURE, Refrigerant Charging Procedure.>
AC-01778
AC-01732
AC-01733
AC-01779
AC-01780
AC-30
Control Unit (Manual A/C Model)
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
13.Control Unit (Manual A/C
Model)
A: REMOVAL
1) Disconnect the ground cable from battery.
2) Remove the ornament panel. <Ref. to EI-52,
ORNAMENT PANEL, REMOVAL, Center Con-
3) Remove the control wires from both sides of the
heater and cooling unit.
4) Remove the screws and claws, and remove the
control module from the ornament panel.
B: INSTALLATION
CAUTION:
Securely assemble the plate at the end of the
control wire to the heater case.
Install each part in the reverse order of removal.
Tightening torque:
Refer to “COMPONENT” of “General Descrip-
tion”. <Ref. to AC-7, CONTROL MODULE,
COMPONENT, General Description.>
AC-01736
AC-01737
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