SUBARU LEGACY 1997 Service Repair Manual

1. Heater System
A: SPECIFICATIONS
Item Specifications Condition
Heating capacity4.652 kW (4,000 kcal/h, 15,872 BTU/h) or more ...
When 300 m
3(10,593 cu ft)/h
Mode
selector
switch: HEAT

Te m p .
control lever: FULL HOT

Temperature
difference
between hot
water and
inlet air:65°C (149°F)

Hot water
flow rate: 360
(95.1
US gal, 79.2
Imp gal)/h
Air flow rate 300 m
3(10,593 cu ft)/hHeat mode (FRESH), FULL
HOT at 12.5 V
Max air flow rate 510 m
3(18,008 cu ft)/h
Temperature
control lever: FULL COLD

Blower fan
speed: 4th position

RECIRC
switch
position: RECIRC
Heater core size
(height x length x width x
thickness)193.5 x 152.0 x 25.0 x 0.9 mm
(7.62 x 5.98 x 0.984 x 0.035 in)—
Blower
motorType Magnet motor 230 W or less at 12 V
Fan type and size
(diameter x width)Sirocco fan type
150 x 75 mm (5.91 x 2.95 in)—
2
4-6SPECIFICATIONS AND SERVICE DATA
1. Heater System

1. Heater System
B4M0368A
1Intake unit

2Grommet

3Hose (Inlet)

4Hose (Outlet)

5Heater duct

6Clamp

7Grommet

8Heater unit
9Rear heater duct

10Resistor
Tightening torque: N⋅m (kg-m, ft-lb)
T: 7.35±1.96 (0.750±0.200, 5.421±1.446)
3
4-6COMPONENT PARTS
1. Heater System

2. Heater Unit
G4M0551
1Vent lever

2Side link

3DEF. lever

4Heater case upper

5Heater grommet

6Heater core

7Mix door

8Heater case lower
9Mix rod

10Mix link

11Mix lever

12Foot duct (RH)

13Foot duct (CTR)

14Foot duct (LH)

15Foot lever lower

16Foot door
17Vent door

18DEF. door

19Foot lever upper
Tightening torque: N⋅m (kg-m, ft-lb)
T: 7.35±1.96
(0.750±0.200, 5.421±1.446)
4
4-6COMPONENT PARTS
2. Heater Unit

3. Intake Unit
G4M0920
1Intake unit case upper

2Lever (A)

3Link

4Door (A)

5Bell mouth-intake

6Intake unit case lower
7Blower motor ASSY

8Hose

9Actuator rod

10Actuator motor

11Actuator bracket
Tightening torque: N⋅m (kg-m, ft-lb)
T: 7.35±1.96
(0.750±0.200, 5.421±1.446)
5
4-6COMPONENT PARTS
3. Intake Unit

4. Control Unit
B4M0369A
1Back plate

2Bulb

3Fan switch ASSY

4Illumi. plate

5Switch base

6Control panel

7Fan switch knob

8RECIRC switch
9A/C switch

10Temp. switch knob

11Mode switch

12Temp. lever ASSY

13Base plate

14Control amp.

15Temp. control cable
6
4-6COMPONENT PARTS
4. Control Unit

1. Supplemental Restraint System
“Airbag”
Airbag system wiring harness is routed near the instrument
panel, heater unit, blower motor and control unit.
CAUTION:

All Airbag system wiring harness and connectors
are colored yellow. Do not use electrical test equip-
ment on these circuit.

Be careful not to damage Airbag system wiring har-
ness when servicing the instrument panel, heater unit,
blower motor and control unit.
2. Heater Unit
A: REMOVAL AND INSTALLATION
1) Disconnect GND cable from battery.
2) Remove heater hoses (inlet, outlet) in engine compart-
ment.
NOTE:
Drain as much coolant from heater unit as possible, and
plug disconnected hose with cloth.
<Ref. to 2-5 [W1A0].>
3) Remove instrument panel.
<Ref. to 5-4 [W1A0].>
4) Remove steering support beam.
<Ref. to 5-1 [C700].>
5) Remove evaporator. (With A/C model)
<Ref. to 4-7 [W14A0].>
G4M0554
6) Remove heater unit.
7
4-6SERVICE PROCEDURE
1. Supplemental Restraint System“Airbag”- 2. Heater Unit

1. Supplemental Restraint System
“Airbag”
Airbag system wiring harness is routed near the instrument
panel, heater unit, blower motor and control unit.
CAUTION:

All Airbag system wiring harness and connectors
are colored yellow. Do not use electrical test equip-
ment on these circuit.

Be careful not to damage Airbag system wiring har-
ness when servicing the instrument panel, heater unit,
blower motor and control unit.
2. Heater Unit
A: REMOVAL AND INSTALLATION
1) Disconnect GND cable from battery.
2) Remove heater hoses (inlet, outlet) in engine compart-
ment.
NOTE:
Drain as much coolant from heater unit as possible, and
plug disconnected hose with cloth.
<Ref. to 2-5 [W1A0].>
3) Remove instrument panel.
<Ref. to 5-4 [W1A0].>
4) Remove steering support beam.
<Ref. to 5-1 [C700].>
5) Remove evaporator. (With A/C model)
<Ref. to 4-7 [W14A0].>
G4M0554
6) Remove heater unit.
7
4-6SERVICE PROCEDURE
1. Supplemental Restraint System“Airbag”- 2. Heater Unit

7) Installation is in the reverse order of removal.
Fitted length of heater hose over pipe:
25 — 30 mm (0.98 — 1.18 in)
8) Pour coolant. <Ref. to 2-5 [W1B0].>
B5M0025
3. Blower Motor Assembly
A: REMOVAL AND INSTALLATION
1) Disconnect GND cable from battery.
2) Remove glove box and pocket back panel. <Ref. to 5-4
[W1A0].>
3) Disconnect blower motor harness connector.
G4M0555
4) Disconnect aspirator pipe1.
5) Remove blower motor mounting screw.
6) Remove blower motor assembly.
7) Installation is in the reverse order of removal.
8
4-6SERVICE PROCEDURE
2. Heater Unit - 3. Blower Motor Assembly

7) Installation is in the reverse order of removal.
Fitted length of heater hose over pipe:
25 — 30 mm (0.98 — 1.18 in)
8) Pour coolant. <Ref. to 2-5 [W1B0].>
B5M0025
3. Blower Motor Assembly
A: REMOVAL AND INSTALLATION
1) Disconnect GND cable from battery.
2) Remove glove box and pocket back panel. <Ref. to 5-4
[W1A0].>
3) Disconnect blower motor harness connector.
G4M0555
4) Disconnect aspirator pipe1.
5) Remove blower motor mounting screw.
6) Remove blower motor assembly.
7) Installation is in the reverse order of removal.
8
4-6SERVICE PROCEDURE
2. Heater Unit - 3. Blower Motor Assembly

B5M0027
4. Control Unit
A: REMOVAL
1) Disconnect GND cable from battery.
2) Set temperature control lever to“FULL COLD”position.
3) Remove temperature control cable from heater unit.
NOTE:
Do not attempt to move link of heater unit during installa-
tion.
B4M0370
4) Remove cup holder.
5) Remove center panel and then disconnect connector.
B4M0059
6) Remove control unit assembly and disconnect connec-
tor.
B4M0060A
B: INSPECTION
1. FAN SWITCH
Check continuity between terminals at each switch posi-
tion.
Switch
positionTerminals
123456
1

2
3
4
GND IGN
9
4-6SERVICE PROCEDURE
4. Control Unit