Daewoo Nubira. Manual — part 183
7A – 28
I
HEATING AND VENTILATION SYSTEM
DAEWOO V–121 BL4
GENERAL DESCRIPTION
AND SYSTEM OPERATION
HEATING AND VENTILATION
SYSTEMS
The base heater system is designed to provide heating,
ventilation, windshield defrosting, and side window defog-
ging. On some vehicles, it also provides heat directly to the
rear seat area.
The heater and fan assembly blower regulates the airflow
from the air inlet for further processing and distribution.
The heater core transfers the heat from the engine coolant
to the inlet air.
The temperature door regulates the amount of air that
passes through the heater core. The temperature door
also controls the temperature of air by controlling the mix
of heated air with ambient air.
The mode door regulates the flow and the distribution of
processed air to the heater ducts and to the defroster
ducts.
The console–mounted heating and ventilation control pan-
el contains three rotary control knobs and two push control
knobs which operate as follows:
Rotary Temperature Control Knob
S
Actuates by cable.
S
Raises the temperature of air entering the vehicle
by rotation toward the right, or the red portion of the
knob.
Rotary Mode Control Knob
S
Actuates by vacuum.
S
Regulates the air distribution between the wind-
shield, the instrument panel, and the floor vents.
Rotary Blower Control Knob
S
Turns ON to operate the blower motor at four
speeds.
S
Turns OFF to stop the blower.
S
Operates completely independently from both the
mode control knob and the temperature control
knob.
S
Changes the fan speed in any mode and at any
temperature setting.
Rear Window Defogger Push Knob
S
Controls the rear window defogger.
S
Turns On the rear window defogger when the push
knob is pressed and illuminates the indicator lamp.
Fresh Air Control Push Knob
S
Operates by vacuum.
S
Switches between recirculating the passenger
compartment air and bringing outside air into the
passenger compartment.
S
Is normally in the fresh air mode.
S
Illuminates the indicator lamp when in the recircu-
lating mode.
SECTION : 7B
MANUAL CONTROL HEATING, VENTILATION,
AND AIR CONDITIONING SYSTEM
CAUTION : Disconnect the negative battery cable before removing or installing any electrical unit or when a tool
or equipment could easily come in contact with exposed electrical terminals. Disconnecting this cable will help
prevent personal injury and damage to the vehicle. The ignition must also be in LOCK unless otherwise noted.
TABLE OF CONTENTS
SPECIFICATIONS
7B–2
. . . . . . . . . . . . . . . . . . . . . . . . . .
A/C SYSTEM CHARGING CAPACITY
7B–2
. . . . . . .
FASTENER TIGHTENING
SPECIFICATIONS
7B–2
. . . . . . . . . . . . . . . . . . . . . . .
SPECIAL TOOLS
7B–3
. . . . . . . . . . . . . . . . . . . . . . . . . . .
SPECIAL TOOLS TABLE
7B–3
. . . . . . . . . . . . . . . . . . .
SCHEMATIC AND ROUTING DIAGRAMS
7B–6
. . . . .
A/C SYSTEM – TYPICAL
7B–6
. . . . . . . . . . . . . . . . . . .
AIRFLOW – TYPICAL
7B–7
. . . . . . . . . . . . . . . . . . . . . .
A/C SCHEMATIC
7B–8
. . . . . . . . . . . . . . . . . . . . . . . . . .
DIAGNOSIS
7B–9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GENERAL DIAGNOSIS
7B–9
. . . . . . . . . . . . . . . . . . . . . .
TESTING THE REFRIGERANT SYSTEM
7B–9
. . . .
INSUFFICIENT COOLING ”QUICK CHECK”
PROCEDURE
7B–9
. . . . . . . . . . . . . . . . . . . . . . . . . . .
A/C PERFORMANCE TEST
7B–10
. . . . . . . . . . . . . . .
PRESSURE–TEMPERATURE
RELATIONSHIP OF R–134A
7B–11
. . . . . . . . . . . . .
LEAK TESTING THEREFRIGERANT
SYSTEM
7B–12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V5 SYSTEM AIR CONDITIONING
DIAGNOSIS
7B–13
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INSUFFICIENT COOLING DIAGNOSIS
7B–13
. . . . .
SYMPTOM DIAGNOSIS
7B–17
. . . . . . . . . . . . . . . . . . . .
PRESSURE TEST CHART
(R–134a SYSTEM)
7B–17
. . . . . . . . . . . . . . . . . . . . . .
LOW AND HIGH SIDE PRESSURE
RELATIONSHIP CHART
7B–19
. . . . . . . . . . . . . . . . .
MAINTENANCE AND REPAIR
7B–20
. . . . . . . . . . . . . .
ON–VEHICLE SERVICE
7B–20
. . . . . . . . . . . . . . . . . . . .
GENERAL A/C SYSTEM SERVICE
PROCEDURES
7B–20
. . . . . . . . . . . . . . . . . . . . . . . . . .
O–RING REPLACEMENT
7B–20
. . . . . . . . . . . . . . . . .
HANDLING REFRIGERANT
7B–20
. . . . . . . . . . . . . . .
HANDLING OF REFRIGERANT LINES
AND FITTINGS
7B–20
. . . . . . . . . . . . . . . . . . . . . . . . .
MAINTAINING CHEMICAL STABILITY
IN THE REFRIGERATION SYSTEM
7B–20
. . . . . .
DISCHARGING, ADDING OIL, EVACUATING,
AND CHARGING PROCEDURES
FOR A/C SYSTEM
7B–21
. . . . . . . . . . . . . . . . . . . . . .
SERVICEABLE COMPONENTS
7B–23
. . . . . . . . . . . . .
TEMPERATURE CONTROL CABLE
7B–23
. . . . . . . .
CONTROL ASSEMBLY
7B–23
. . . . . . . . . . . . . . . . . . .
CONTROL ASSEMBLY KNOB LIGHTING
7B–23
. . .
BLOWER MOTOR
7B–23
. . . . . . . . . . . . . . . . . . . . . . . .
HIGH–BLOWER RELAY
7B–23
. . . . . . . . . . . . . . . . . . .
BLOWER RESISTOR
7B–23
. . . . . . . . . . . . . . . . . . . . .
CONTROL ASSEMBLY SWITCHES
7B–23
. . . . . . . .
A/C PRESSURE TRANSDUCER
7B–24
. . . . . . . . . . .
A/C COMPRESSOR RELAY
7B–25
. . . . . . . . . . . . . . .
AIR FILTER
7B–26
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A/C CONTROL VACUUM TANK
7B–27
. . . . . . . . . . . .
A/C EXPANSION VALVE
7B–28
. . . . . . . . . . . . . . . . . .
HEATER/AIR DISTRIBUTOR
CASE ASSEMBLY
7B–29
. . . . . . . . . . . . . . . . . . . . . .
A/C HIGH–PRESSURE PIPE LINE
7B–30
. . . . . . . . .
HEATER HOSES
7B–32
. . . . . . . . . . . . . . . . . . . . . . . . .
HEATER CORE
7B–32
. . . . . . . . . . . . . . . . . . . . . . . . . .
EVAPORATOR CORE
7B–32
. . . . . . . . . . . . . . . . . . . .
A/C SUCTION HOSE ASSEMBLY
7B–34
. . . . . . . . . .
RECEIVER–DRYER
7B–35
. . . . . . . . . . . . . . . . . . . . . .
COMPRESSOR
7B–36
. . . . . . . . . . . . . . . . . . . . . . . . . .
CONDENSER
7B–38
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
UNIT REPAIR
7B–40
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMPONENT LOCATOR
7B–40
. . . . . . . . . . . . . . . . . . .
V5 COMPRESSOR
7B–40
. . . . . . . . . . . . . . . . . . . . . . .
V5 AIR CONDITIONING
COMPRESSOR OVERHAUL
7B–42
. . . . . . . . . . . . . .
7B – 2
I
MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
DAEWOO V–121 BL4
CLUTCH PLATE AND HUB ASSEMBLY
7B–42
. . . . .
CLUTCH ROTOR AND BEARING
7B–44
. . . . . . . . . .
CLUTCH COIL
7B–47
. . . . . . . . . . . . . . . . . . . . . . . . . . .
SHAFT SEAL REPLACEMENT
7B–49
. . . . . . . . . . . . .
PRESSURE RELIEF VALVE
7B–51
. . . . . . . . . . . . . . .
CONTROL VALVE ASSEMBLY
7B–52
. . . . . . . . . . . . .
REAR HEAD, GASKET, VALVE PLATE,
REED PLATE, AND O–RING
7B–53
. . . . . . . . . . . . .
CYLINDER TO FRONT HEAD O–RING
7B–55
. . . . .
LEAK TESTING (EXTERNAL)
7B–57
. . . . . . . . . . . . . .
GENERAL DESCRIPTION AND SYSTEM
OPERATION
7B–58
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GENERAL INFORMATION
7B–58
. . . . . . . . . . . . . . . . . .
THE V5 A/C SYSTEM
7B–58
. . . . . . . . . . . . . . . . . . . . .
SYSTEM COMPONENTS – FUNCTIONAL
7B–58
. .
SYSTEM COMPONENTS – CONTROL
7B–59
. . . . .
V5 COMPRESSOR –
GENERAL DESCRIPTION
7B–59
. . . . . . . . . . . . . . .
V5 COMPRESSOR –
DESCRIPTION OF OPERATION
7B–60
. . . . . . . . .
SPECIFICATIONS
A/C SYSTEM CHARGING CAPACITY
Application
Description
R–134a System
750
µ
20 g
Refrigerant Oil in A/C System
Synthetic PAG 265 ml
FASTENER TIGHTENING SPECIFICATIONS
Application
N
S
m
Lb–Ft
Lb–In
A/C Suction Hose Clamp Bolt
10
–
89
Air Cleaner Housing Assembly Retaining Bolts
10
–
89
Band Clamp Bolt
5
–
44
Clamp Bolts
4
–
35
Clutch Plate and Hub Assembly Retaining Nut
17
13
–
Discharge Hose Connecting Block–to–Compressor Retaining
Nut
33
24
–
Discharge Hose Mounting Block–to–Condenser Nut
16
12
–
Evaporator Flange Connecting Block Retaining Nut
10
–
89
Expansion Valve Bolts
10
–
89
Front Compressor–to–Bracket Bolts
35
26
–
High Pressure Pipe–to–Evaporator Flange Connecting Block
Nut
10
–
89
High Pressure Pipe–to–Receiver–Dryer Connecting Block Nuts
10
–
69
Liquid Evaporator Pipe Clamp Bolt
4
–
35
Pressure Relief Valve
16
12
–
Pressure Transducer
10
–
89
Rear Compressor–to–Bracket Bolts
20
15
–
Suction Hose Connecting Block Retaining Nut
10
–
89
Suction Hose Support Clamp Retaining Bolt
5
–
44
Suction Hose Support Clamp Retaining Nut
5
–
44
Through–Bolts
10
–
89
Upper Condenser Mount Nuts
4
–
35
Vacuum Tank–to–Bulkhead Nuts
4
–
35
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
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