Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. 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,

Center Console.>

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,

Center Console.>

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-

MENT, Engine Coolant.>

• STI model: <Ref. to CO(STI)-13, FILLING OF

ENGINE COOLANT, REPLACEMENT, Engine

Coolant.>

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-

sole.>

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