2003 DAEWOO MATIZ heating system

7A–26 HEATING AND VENTILATION SYSTEM
DAEWOO M-150 BL2
D18A531B
Installation Procedure
1. Install the blower module with the nuts.
Tighten
Tighten the blower module retaining nuts to 3–5 Nm
(27–44 lb-in).
2. Connect the wiring harness.
3. Connect the blower motor connector. Refer to “Blow-
er Motor and Cooling Hose” in this section.
4. Install the blower resistor. Refer to “Blower Resistor”
in this section.
5. Install the evaporator on the vehicle equipped with
A/C. Refer to Section 7B, Manual Control Heating,
Ventilation, and Air Conditioning System.
6. Install the heater module–to–blower module connec-
tion tube on the vehicle not equipped with A/C. Refer
to “Heater Module” in this section.
7. Install the glove box to the instrument panel. Refer to
Section 9E, Instrumentation/Driver Information.
D108A532
DEFROSTER DUCT AND HOSES
(Left–Hand Drive Shown, Right–Hand
Drive Similar)
Removal Procedure
1. Remove the instrument panel. Refer to Section 9E,
Instrumentation/Driver Information.
2. Remove the defroster duct and hoses retaining
screws.
a. Retaining screw.
3. Remove the defroster duct and hoses.
b. Defroster duct and hoses.
D108A533
Installation Procedure
1. Install the defroster duct and hoses with the screws.
2. Install the instrument panel. Refer to Section 9E, In-
strumentation/Driver Information.

HEATING AND VENTILATION SYSTEM 7A–27
DAEWOO M-150 BL2
D18A534A
VENTILATION DUCT
(Left–Hand Drive Shown, Right–Hand
Drive Similar)
Removal Procedure
1. Remove the instrument panel. Refer to Section 9E,
Instrumentation/Driver Information.
2. Remove the ventilation duct retaining screws.
a. Retaining screw.
3. Remove the ventilation duct.
b. Ventilation duct.
D108A535
Installation Procedure
1. Install the ventilation duct with the screws.
2. Install the instrument panel. Refer to Section 9E, In-
strumentation/Driver Information.

7A–28 HEATING AND VENTILATION SYSTEM
DAEWOO M-150 BL2
UNIT REPAIR
D108A701
HEATER CORE
Disassembly Procedure
1. Remove the heater module. Refer to “Heater Module”
in this section.
2. Remove the heater core.

Remove the heater core cover (1).

Remove the heater core (2).
D108A702
Assembly Procedure
1. Install the heater core to the heater module.
2. Install the heater core cover.
3. Install the heater module. Refer to “Heater Module” in
this section.

HEATING AND VENTILATION SYSTEM 7A–29
DAEWOO M-150 BL2
SPECIFICATIONS
GENERAL SPECIFICATIONS
Application Unit Description
Maximum Heating Capacity cal/h 7,300
1 st Ω 2.25 – 2.75
2 nd Ω 1.08 – 1.32
Blower Motor Resistance 3 rd Ω 0.36 – 0.44
4 th Ω –
FASTENER TIGHTENING SPECIFICATIONS
Application Nm Lb-Ft Lb-In
Heater Module Nuts3 – 5–27 – 44
Blower Module Nuts3 – 5–27 – 44

7A–30 HEATING AND VENTILATION SYSTEM
DAEWOO M-150 BL2
SPECIAL TOOLS AND EQUIPMENT
SPECIAL TOOLS TABLE
D102B119
DW 100–020
Spring Clamp
Remover/Installer

HEATING AND VENTILATION SYSTEM 7A–31
DAEWOO M-150 BL2
SCHEMATIC AND ROUTING DIAGRAMS
NON–A/C DIAGRAMS
D18A201B

7A–32 HEATING AND VENTILATION SYSTEM
DAEWOO M-150 BL2
AIR FLOW THROUGH DUCTS (NON–A/C)
(Left–Hand Drive Shown, Right–Hand Drive Similar)
D108A202

DAEWOO M-150 BL2

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 B unless otherwise
noted.
TABLE OF CONTENTS
Description and Operation 7B-2. . . . . . . . . . . . . . . . . .
System Components – Functional 7B-2. . . . . . . . . . .
Component Locator 7B-3. . . . . . . . . . . . . . . . . . . . . . . .
A/C System 7B-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Information and Procedures 7B-5. . . . .
General Diagnosis 7B-5. . . . . . . . . . . . . . . . . . . . . . . . . . .
Testing the Refrigerant System 7B-5. . . . . . . . . . . . . .
Insufficient Cooling “Quick Check”
Procedure 7B-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pressure-Temperature Relationship
of R-134a 7B-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Leak Testing the Refrigerant System 7B-7. . . . . . . . .
Air Conditioning System Diagnosis 7B-8. . . . . . . . . . . . .
Insufficient Cooling Diagnosis 7B-8. . . . . . . . . . . . . . .
Symptom Diagnosis 7B-11. . . . . . . . . . . . . . . . . . . . . . . .
Pressure Test Chart (R-134a System) 7B-11. . . . . . .
Repair Instructions 7B-13. . . . . . . . . . . . . . . . . . . . . . . .
On-Vehicle Service 7B-13. . . . . . . . . . . . . . . . . . . . . . . . .
General A/C System Service Procedures 7B-13. . . . . .
O-Ring Replacement 7B-13. . . . . . . . . . . . . . . . . . . . .
Handling Refrigerant 7B-13. . . . . . . . . . . . . . . . . . . . . .
Handling of Refrigerant Lines and Fittings 7B-13. . .
Maintaining Chemical Stability in the
Refrigeration System 7B-14. . . . . . . . . . . . . . . . . . .
Discharging, Adding Oil, Evacuating, and
Charging Procedures for A/C System 7B-14. . . . . Serviceable Components 7B-17. . . . . . . . . . . . . . . . . . . .
Control Assembly and Control Cables 7B-17. . . . . . .
Blower Motor and Cooling Hose 7B-17. . . . . . . . . . . .
Blower Resistor 7B-17. . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Motor Switch 7B-17. . . . . . . . . . . . . . . . . . . . . .
A/C Push Knob 7B-18. . . . . . . . . . . . . . . . . . . . . . . . . .
Receiver–Dryer and Dual Cut Switch 7B-18. . . . . . . .
Receiver–Dryer Bracket 7B-20. . . . . . . . . . . . . . . . . . .
Compressor 7B-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Condenser 7B-21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A/C High Pressure Pipe Line 7B-22. . . . . . . . . . . . . . .
A/C Low Pressure Pipe Line 7B-25. . . . . . . . . . . . . . .
Evaporator Unit and Drain Hose 7B-26. . . . . . . . . . . .
Unit Repair 7B-28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Evaporator Core and Expansion Valve 7B-28. . . . . .
Compressor Overhaul 7B-29. . . . . . . . . . . . . . . . . . . . .
Specifications 7B-30. . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Specifications 7B-30. . . . . . . . . . . . . . . . . . . .
Fastener Tightening Specifications 7B-30. . . . . . . . . .
Special Tools and Equipment 7B-31. . . . . . . . . . . . . .
Special Tools Table 7B-31. . . . . . . . . . . . . . . . . . . . . . .
Schematic and Routing Diagrams 7B-32. . . . . . . . . .
A/C Diagrams 7B-32. . . . . . . . . . . . . . . . . . . . . . . . . . . .
A/C Airflow (Typical) 7B-33. . . . . . . . . . . . . . . . . . . . . .
A/C System (Typical) 7B-33. . . . . . . . . . . . . . . . . . . . .