2004 DAEWOO LACETTI driver

7A – 20IHEATING AND VENTILATION SYSTEM
DAEWOO V–121 BL4
CONTROL ASSEMBLY
Removal Procedure
1. Disconnect the negative battery cable.
2. Remove the center molding. Refer toSection 9E,
Instrumentation/Driver Information.
3. Disconnect the mode control cable from the mode
door.
4. Disconnect the electrical connectors.
5. Disconnect the temperature control cable by gently
prying the cable eyelet from the post on the control-
ler. Unsnap the cable housing from the mechanical
slide. Note the location of the cable and the housing
for ease of installation.
6. Pull out the center molding.
7. Remove the four controller retaining screws.
8. Remove the control assembly from the center
molding.
Installation Procedure
1. Install the control assembly with the retaining
screws to the center molding.
Tighten
Tighten the controller retaining screws to 2 NSm (18
lb–in).
2. Press the cable end eyelet onto the post on the
controller.
3. Attach the mechanical cable housing to its original
control position.
4. Connect the electrical connectors to the sockets on
the back of the controller.

HEATING AND VENTILATION SYSTEM 7A – 21
DAEWOO V–121 BL4
5. Gently insert the center molding into position on the
instrument panel.
6. Connect the negative battery cable.
7. Confirm the proper operation of the controller by
moving it through all of the controller’s possible
functioning positions.
CONTROL ASSEMBLY KNOB
LIGHTING
(Left–Hand Drive Shown, Right–Hand Drive Similar)
Removal Procedure
1. Disconnect the negative battery cable.
2. Remove the center molding. Refer to ”Control As-
sembly” in this section.
3. Turn the bulb holder to the left and pull out the bulb.
Installation Procedure
1. Install the bulb into the holder and turn the bulb to
the right.
2. Install the control assembly. Refer to ”Control As-
sembly” in this section.
3. Connect the negative battery cable.
4. Check the knob light for proper operation.
HEATER/AIR DISTRIBUTOR CASE
ASSEMBLY
Removal Procedure
1. Disconnect the negative battery cable.
2. Remove the instrument panel and tie–bar. Refer to
Section 9E, Instrumentation/Driver Information.
3. Drain the cooling system. Refer to Section 1D, En-
gine Cooling.
4. Compress the heater hose clamps at the firewall
and slide the clamps toward the engine.
5. Remove the two heater hoses from the core pipes
at the firewall.

HEATING AND VENTILATION SYSTEM 7A – 23
DAEWOO V–121 BL4
Tighten
Tighten the heater/air distributor case assembly
screws to 4 NSm (35 lb–in).
5. Install the heater/air distributor case assembly
screws at the side of the heater core pipes through
the firewall from the engine compartment side.
Tighten
Tighten the heater/air distributor case assembly
screw to 4 NSm (35 lb–in).
6. Install the two heater hoses.
7. Slide the heater hose clamps into position.
8. Connect the rear duct connector.
9. Install the instrument panel and tie–bar. Refer to
Section 9E, Instrumentation/Driver Information.
10. Fill the cooling system. Refer to Section 1D, Engine
Cooling.
11. Connect the negative battery cable.
12. Operate the controls to verify the proper function of
the heating and ventilation systems.
BLOWER MOTOR
Removal Procedure
1. Disconnect the negative battery cable.
2. Remove the glove box. Refer to Section 9E, Instru-
mentation/Driver Information.
3. Put the floor carpet aside for preventing stain.
4. Disconnect the blower motor electrical connector
and resistor connector.
5. Remove the screws that secure the motor to the
heater/air distributor case.

7A – 24IHEATING AND VENTILATION SYSTEM
DAEWOO V–121 BL4
6. Remove the motor, the seal, and the shock mount
pads from the heater/air distributor case by gently
pulling the motor straight down and out.
Installation Procedure
1. Install the blower motor and the seal with the shock
mount pads in the heater/air distributor case. Hold
the blower motor in position.
2. Install the screws to secure the blower motor to the
heater/air distributor case.
Tighten
Tighten the blower motor retaining screws to 1.2 NSm
(11 lb–in).
3. Connect the blower motor electrical connector and
resistor connector.
4. Connect the negative battery cable.
5. Confirm that the blower motor operates properly.
6. Replace the glove box. Refer to Section 9E, Instru-
mentation/Driver Information.
HIGH–BLOWER RELAY
Removal Procedure
1. Disconnect the negative battery cable.
2. Remove the glove box housing. Refer to Section
9E, Instrumentation/Driver Information.
3. Separate the connector from the bracket.
4. Disconnect the relay from the connector.
Installation Procedure
1. Connect the relay to the connector.
2. Insert the connector to the bracket.
3. Install the glove box. Refer to Section 9E, Instru-
mentation/Driver Information.

HEATING AND VENTILATION SYSTEM 7A – 25
DAEWOO V–121 BL4
BLOWER RESISTOR
Removal Procedure
1. Disconnect the negative battery cable.
2. Remove the glove box. Refer to Section 9E, Instru-
mentation/Driver Information.
3. Disconnect the electrical connector at the resistor.
4. Remove the mount screws from the resistor.
5. Remove the resistor from the heater/air distributor
case by gently pulling the resistor downward.
Installation Procedure
1. Install the resistor into the heater/air distributor
case with the screws.
Tighten
Tighten the blower motor resistor screws to 1.2 NSm
(11 lb–in).
2. Connect the electrical connector at the resistor.
3. Connect the negative battery cable.
4. Confirm the proper performance of the blower.
5. Replace the glove box. Refer to Section 9E, Instru-
mentation/Driver Information.
HEATER HOSES
Removal Procedure
1. Partially drain the cooling system.
2. Raise and suitably support the vehicle.
3. Compress and slide rearward the two heater hose
spring clamps at the firewall.
4. Gently twist the hose from the left to the right and
back again to loosen the bond between the hose
and the tube.
5. Remove the end of the hose from the tube.
6. Repeat Steps 3 and 4 with the other hose.
7. Compress the heater hose spring clamp on the inlet
coolant line and slide the clamp rearward.
8. Remove the inlet heater hose from the vehicle.
9. Compress the heater hose spring clamp on the out-
let coolant line and slide the clamp backward.
10. Remove the outlet heater hose from the vehicle.

MANUAL CONTROL HEATING, VENTILATION AND AIR CONDITIONING SYSTEM 7B – 3
DAEWOO V–121 BL4
SPECIAL TOOLS
SPECIAL TOOLS TABLE
J–5403
Snap Ring Pliers
J–6083
Snap Ring Pliers
J–8092
Driver Handle
J–8433–1
Puller Crossbar
J–8433–3
Forcing Screw
J–9398–A
Bearing Remover
J–9481
Bearing Installer
J–9553–1
O–Ring Remover

7B – 14IMANUAL CONTROL HEATING, VENTILATION AND AIR CONDITIONING SYSTEM
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
151. Record the low– and the high–side pressures
after the A/C system has been operating for 5
minutes or more with the engine cooling fan
ON.
2. Locate the intersection of the low– and the high
side pressures. Refer to ”Low– and High–Side
Pressure Relationship Chart” in this section.
Do the low– and the high–side pressures intersect
in the white area of the chart?–System OKGo to Step 16
16Check the high– and the low–side pressures.
Do the low– and the high–side pressures intersect
in the grey area of the chart?–Go to Step 17Go to Step 20
17Feel the liquid pipe between the condenser and the
expansion valve.
Is the pipe cold?–Go to Step 18Go to Step 19
181. Examine the condenser for any restriction of
the airflow.
2. Check the cooling fans for proper operation.
3. Remove the restriction or repair the fans, as
required.
Is the pipe temperature normal now?At least 7°C
(12°F) below
ambient air
temperatureGo to Step 13–
191. Recover, evacuate, and recharge the A/C sys-
tem.
2. Check the A/C system for leaks.
Is the system free from leaks?–Go to Step 13–
20Observe the readings on the pressure gauges.
Are the A/C compressor high– and the low–side
pressures within the specified value of each other?207 kPa
(30 psi)Go to Step 21Go to Step 26
211. Run the engine at 3,000 rpm.
2. Set the A/C controls to the following positions:
S The A/C switch to the ON.
S The fresh air control switch to fresh air.
S The blower motor to 4.
S The temperature to full cold.
3. Close all of the vehicle’s windows and doors.
4. Turn the A/C switch ON and OFF every 20
seconds for 3 minutes.
Are the A/C compressor high– and the low–side
pressures within the specified value of each other?207 kPa
(30 psi)Go to Step 22Go to Step 13
22Observe the pressure rise on both gauges and the
temperatures of both the compressor suction pipe
and the discharge pipe.
Is the pressure rise on both gauges slow and the
suction pipe warm with the discharge pipe very hot?–Go to Step 25Go to Step 23
231. Turn the ignition switch to LOCK.
2. Make sure the compressor clutch is disen-
gaged.
3. Attempt to turn the clutch driver (not the
pulley).
Can you turn the clutch driver freely by hand?–Go to Step 25Go to Step 24

MANUAL CONTROL HEATING, VENTILATION AND AIR CONDITIONING SYSTEM 7B – 25
DAEWOO V–121 BL4
AIR FILTER
(Left–Hand Drive Shown, Right–Hand Drive
Similar)
Removal Procedure
1. Remove the glove box. Refer to Section 9E, Instru-
mentation/Driver Information.
2. Remove the screws and the air filter.
3. Remove the air filter.
Installation Procedure
1. Install the air filter.
2. Install the air filter cover and the screws.
3. Install the glove box. Refer to Section 9E, Instru-
mentation/Driver Information.
A/C EXPANSION VALVE
(Left–Hand Drive Shown, Right–Hand Drive
Similar)
Removal Procedure
1. Disconnect the negative battery cable.
2. Recover the refrigerant. Refer to ”Discharging, Add-
ing Oil, Evacuating, and Charging Procedures for
A/C System” in this section.
3. Remove the suction hose/liquid pipe block retaining
nuts at the fire wall.
4. Remove the expansion valve connector block re-
taining stud bolts.
5. Remove the expansion valve.
6. Discard the O–rings.