1999 SUBARU LEGACY heat

1. Precaution
A: SUPPLEMENTAL RESTRAINT
SYSTEM ªAIRBAGº
CAUTION:
IAll Airbag system wiring harness and con-
nectors are colored yellow. Do not use electri-
cal test equipment on these circuit.
IBe careful not to damage Airbag system wir-
ing harness when servicing the instrument
panel, heater unit, blower motor and control
unit.
Airbag system wiring harness is routed near 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
compartment.
NOTE:
Drain as much coolant from heater unit as
possible, and plug disconnected hose with cloth.

3) Remove instrument panel. [W1A0].>
4) Remove steering support beam. [C600].>
5) Remove evaporator. (With A/C model) 4-7 [W14A0].>
6) Remove heater unit.
G4M0554
7) Installation is in the reverse order of removal.
Fitted length of heater hose over pipe:
25 Ð 30 mm (0.98 Ð 1.18 in)
8) Pour coolant.
7
[W2A0]4-6SERVICE PROCEDURE
2. Heater Unit

1. Precaution
A: SUPPLEMENTAL RESTRAINT
SYSTEM ªAIRBAGº
CAUTION:
IAll Airbag system wiring harness and con-
nectors are colored yellow. Do not use electri-
cal test equipment on these circuit.
IBe careful not to damage Airbag system wir-
ing harness when servicing the instrument
panel, heater unit, blower motor and control
unit.
Airbag system wiring harness is routed near 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
compartment.
NOTE:
Drain as much coolant from heater unit as
possible, and plug disconnected hose with cloth.

3) Remove instrument panel. [W1A0].>
4) Remove steering support beam. [C600].>
5) Remove evaporator. (With A/C model) 4-7 [W14A0].>
6) Remove heater unit.
G4M0554
7) Installation is in the reverse order of removal.
Fitted length of heater hose over pipe:
25 Ð 30 mm (0.98 Ð 1.18 in)
8) Pour coolant.
7
[W2A0]4-6SERVICE PROCEDURE
2. Heater Unit

3. Blower Motor Assembly
A: REMOVAL AND INSTALLATION
1) Disconnect GND cable from battery.
2) Remove glove box and pocket back panel.

3) Disconnect blower motor harness connector.
B5M0025
4) Disconnect aspirator pipe (A).
5) Remove blower motor mounting screw.
B4M1082B
6) Remove blower motor assembly.
7) Installation is in the reverse order of removal.
4. Control Unit
A: REMOVAL AND INSTALLATION
1) Disconnect GND cable from battery.
2) Set temperature control lever to ªFULL COLDº
position.
3) Remove temperature control cable from heater
unit.
NOTE:
Do not attempt to move link of heater unit during
installation.
B5M0027
4) Remove cup holder.
5) Remove center panel and then disconnect con-
nector.
B4M0370
6) Remove control unit assembly and disconnect
connector.
B4M0059
7) Installation is in the reverse order of removal.
NOTE:
Before control unit installation, set temperature
control lever to ªFULL COLDº position.
8
4-6[W3A0]SERVICE PROCEDURE
3. Blower Motor Assembly

3. Blower Motor Assembly
A: REMOVAL AND INSTALLATION
1) Disconnect GND cable from battery.
2) Remove glove box and pocket back panel.

3) Disconnect blower motor harness connector.
B5M0025
4) Disconnect aspirator pipe (A).
5) Remove blower motor mounting screw.
B4M1082B
6) Remove blower motor assembly.
7) Installation is in the reverse order of removal.
4. Control Unit
A: REMOVAL AND INSTALLATION
1) Disconnect GND cable from battery.
2) Set temperature control lever to ªFULL COLDº
position.
3) Remove temperature control cable from heater
unit.
NOTE:
Do not attempt to move link of heater unit during
installation.
B5M0027
4) Remove cup holder.
5) Remove center panel and then disconnect con-
nector.
B4M0370
6) Remove control unit assembly and disconnect
connector.
B4M0059
7) Installation is in the reverse order of removal.
NOTE:
Before control unit installation, set temperature
control lever to ªFULL COLDº position.
8
4-6[W3A0]SERVICE PROCEDURE
3. Blower Motor Assembly

C: ADJUSTMENT
1) Operate temperature control lever to ªFULL
COLDº position.
2) Install control cable to lever (A). While pushing
outer cable, secure control cable with clip (B).
B4M0062C
5. Intake Door Motor
A: REMOVAL AND INSTALLATION
1) Disconnect GND cable from battery.
2) Remove glove box and pocket back panel.

B5M0025
3) Remove heater duct or evaporator. (With A/C
model).
4) Remove intake unit from the vehicle.
G4M0561
10
4-6[W4C0]SERVICE PROCEDURE
5. Intake Door Motor

C: ADJUSTMENT
1) Operate temperature control lever to ªFULL
COLDº position.
2) Install control cable to lever (A). While pushing
outer cable, secure control cable with clip (B).
B4M0062C
5. Intake Door Motor
A: REMOVAL AND INSTALLATION
1) Disconnect GND cable from battery.
2) Remove glove box and pocket back panel.

B5M0025
3) Remove heater duct or evaporator. (With A/C
model).
4) Remove intake unit from the vehicle.
G4M0561
10
4-6[W4C0]SERVICE PROCEDURE
5. Intake Door Motor

6. Mode Door Motor
A: REMOVAL AND INSTALLATION
1) Remove instrument panel.
2) Remove mode door motor.
B4M0063
3) Installation is in the reverse order of removal.
B: INSPECTION
1) When approx. 12 V is applied to the mode door motor terminals, mode door motor operates as follows:
B4M1092A
2) Check mode door motor position switch.
When the mode door motor is moved to each mode position by using the mode selector switch, check if
continuity exists between each terminal as follows:
Mode selector switch positions Terminal No.
VENT 8 or 7
9 (GND) BI-LEV 6 or 7
HEAT 5 or 6
DEF/HEAT 4 or 5
DEF 3or4
12
4-6[W6A0]SERVICE PROCEDURE
6. Mode Door Motor

1. Air Conditioning System
A: SPECIFICATIONS
Item Specifications
Type of air conditioner Reheat air-mix type
Cooling capacity (IMACA)4.885 kW
(4,200 kcal/h, 16,666 BTU/h)
RefrigerantHFC-134a (CH
2FCF3)
[0.55 Ð 0.65 kg
(1.21 Ð 1.43 lb)]
CompressorType 5-vane rotary, fix volume (DKV-14G)
Discharge 140 cm
3(8.54 cu in)/rev
Max. permissible speed 7,000 rpm
Magnet clutchType Dry, single-disc type
Power consumption 45 W
Type of belt V-Ribbed 4 PK
Pulley dia. (effective dia.) 125 mm (4.92 in)
Pulley ratio 1.064
CondenserType Corrugated fin (Multi-flow)
Core face area 0.215 m
2(2.31 sq ft)
Core thickness 19 mm (0.75 in)
Radiation area 4.7 m
2(51 sq ft)
Receiver drier Effective inner capacity 290 cm3(17.70 cu in)
Expansion valve Type Internal equalizing
EvaporatorType A-laminate
Dimensions (W´H´T)60´224´235 mm
(2.36´8.82´9.25 in)
Blower fanFan type Sirocco fan
Outer diameter´width 150´75 mm (5.91´2.95 in)
Power consumption 230 W at 12 V
Condenser fan
(Sub fan)Motor type Magnet
Power consumption 120 W at 12 V
Fan outer diameter 320 mm (12.60 in)
Radiator fan
(Main fan)Motor type Magnet
Power consumption 120 W at 12 V
Fan outer diameter 320 mm (12.60 in)
Idling speed with
F.I.C.D. in operationMPFI model850±100 rpm (700±100 rpm ªDº range in AT
model)
Dual switch
(Pressure switch)
High-pressure line
B4M0755A
Compressor relief valve
blow-out pressure
B4M0084A
2
4-7[S1A0]SPECIFICATIONS AND SERVICE DATA
1. Air Conditioning System