Daewoo Nubira. Manual - part 183

7A – 28

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

Actuates by cable.

Raises the temperature of air entering the vehicle
by rotation toward the right, or the red portion of the
knob.

Rotary Mode Control Knob

Actuates by vacuum.

Regulates the air distribution between the wind-
shield, the instrument panel, and the floor vents.

Rotary Blower Control Knob

Turns ON to operate the blower motor at four
speeds.

Turns OFF to stop the blower.

Operates completely independently from both the
mode control knob and the temperature control
knob.

Changes the fan speed in any mode and at any
temperature setting.

Rear Window Defogger Push Knob

Controls the rear window defogger.

Turns On the rear window defogger when the push
knob is pressed and illuminates the indicator lamp.

Fresh Air Control Push Knob

Operates by vacuum.

Switches between recirculating the passenger
compartment air and bringing outside air into the
passenger compartment.

Is normally in the fresh air mode.

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

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

20 g

Refrigerant Oil in A/C System

Synthetic PAG 265 ml

FASTENER TIGHTENING SPECIFICATIONS

Application

Lb–Ft

Lb–In

A/C Suction Hose Clamp Bolt

–

Air Cleaner Housing Assembly Retaining Bolts

–

Band Clamp Bolt

–

Clamp Bolts

–

Clutch Plate and Hub Assembly Retaining Nut

–

Discharge Hose Connecting Block–to–Compressor Retaining
Nut

–

Discharge Hose Mounting Block–to–Condenser Nut

–

Evaporator Flange Connecting Block Retaining Nut

–

Expansion Valve Bolts

–

Front Compressor–to–Bracket Bolts

–

High Pressure Pipe–to–Evaporator Flange Connecting Block
Nut

–

High Pressure Pipe–to–Receiver–Dryer Connecting Block Nuts

–

Liquid Evaporator Pipe Clamp Bolt

–

Pressure Relief Valve

–

Pressure Transducer

–

Rear Compressor–to–Bracket Bolts

–

Suction Hose Connecting Block Retaining Nut

–

Suction Hose Support Clamp Retaining Bolt

–

Suction Hose Support Clamp Retaining Nut

–

Through–Bolts

–

Upper Condenser Mount Nuts

–

Vacuum Tank–to–Bulkhead Nuts

–

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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