DAEWOO MATIZ 2003 Service Repair Manual
Page 751 of 1184
DAEWOO M-150 BL2
SECTION 7A
HEATING AND VENTILATION 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 7A-2. . . . . . . . . . . . . . . . . .
Heating and Ventilation Systems 7A-2. . . . . . . . . . . .
Component Locator 7A-3. . . . . . . . . . . . . . . . . . . . . . . .
Control Assembly 7A-3. . . . . . . . . . . . . . . . . . . . . . . . .
Blower Module Assembly 7A-4. . . . . . . . . . . . . . . . . . .
Air Distributor and Heater Module
Assembly 7A-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Informatin and Procedures 7A-6. . . . . . .
Heater System 7A-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Insufficient Heating or Defrosting 7A-6. . . . . . . . . . . .
Blower Electrical 7A-10. . . . . . . . . . . . . . . . . . . . . . . . .
Improper Air Delivery or No Mode Shift 7A-11. . . . . .
Too Much Heat 7A-13. . . . . . . . . . . . . . . . . . . . . . . . . . .
Controls 7A-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Noise 7A-16. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repair Instructions 7A-18. . . . . . . . . . . . . . . . . . . . . . . .
On-Vehicle Service 7A-18. . . . . . . . . . . . . . . . . . . . . . . . .
Control Assembly and Control Cables 7A-18. . . . . . . Blower Motor and Cooling Hose 7A-20. . . . . . . . . . . .
Blower Resistor 7A-20. . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Motor Switch 7A-21. . . . . . . . . . . . . . . . . . . . . .
Heater Hoses 7A-22. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heater Module 7A-24. . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Module 7A-25. . . . . . . . . . . . . . . . . . . . . . . . . . .
Defroster Duct and Hoses 7A-26. . . . . . . . . . . . . . . . .
Ventilation Duct 7A-27. . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Repair 7A-28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heater Core 7A-28. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 7A-29. . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Specifications 7A-29. . . . . . . . . . . . . . . . . . . .
Fastener Tightening Specifications 7A-29. . . . . . . . . .
Special Tools and Equipment 7A-30. . . . . . . . . . . . . .
Special Tools Table 7A-30. . . . . . . . . . . . . . . . . . . . . . .
Schematic and Routing Diagrams 7A-31. . . . . . . . . .
Non-A/C Diagrams 7A-31. . . . . . . . . . . . . . . . . . . . . . .
Air Flow Through Ducts (Non–A/C) 7A-32. . . . . . . . .
Page 752 of 1184
7A–2 HEATING AND VENTILATION SYSTEM
DAEWOO M-150 BL2
DESCRIPTION AND SYSTEM OPERATION
HEATING AND VENTILATION
SYSTEMS
The base heater system is designed to provide heating,
ventilation, windshield defrosting, and side window de-
fogging.
The heater and fan assembly blower regulates the air-
flow from the air inlet for further processing and distribu-
tion.
The heater core transfers the heat from the engine cool-
ant to the inlet air.
The temperature door regulates the amount of the air
that passes through the heater core. The temperature
door also controls the temperature of the air by control-
ling the mix of the heated air and the ambient air.
The mode door regulates the flow and the distribution
of the processed air to the heater ducts and to the de-
froster ducts.
This console-mounted heating and ventilation panel
contains the following:
Three Rotary Control Knobs
1. The Rotary Temperature Control Knob
Actuates by cable.
Raises the temperature of the air entering the ve-
hicle by rotation toward the right, or the red portion
of the knob.
2. The Rotary Blower Control Knob
Turns on to operate the blower motor at four speeds.
Turns
to stop the blower.
Operates completely independently both from the
mode control that regulates the defroster door and
from the temperature control knob.Changes the fan speed in any mode and at any
temperature setting.
3. The Rotary Mode Control Knob:
Actuates by cable.
Regulates the air distribution between the wind-
shield, the instrument panel, and the floor vents.
Push Knobs
1. The Rear Window Defogger Push Knob
Controls the rear window defogger.
Turns ON the rear window defogger when the push
knob is pressed and the indicator lamp is illumi-
nated.
2. The A/C Push Knob (if the vehicle is equipped with air
conditioning)
Controls the A/C.
Turns the A/C ON when the push knob is down.
However, if the blower control knob is OFF, the A/C
system is OFF, regardless of the position of the
A/C knob.
One Lever
1. The Fresh Air Control Lever
Operates by cable.
Switches between recirculating passenger compart-
ment air and bringing outside air into the passenger
compartment.
Draws in outside air when the lever is moved to the
left.
Recirculates inside air when the lever is moved to
the right.
Page 753 of 1184
HEATING AND VENTILATION SYSTEM 7A–3
DAEWOO M-150 BL2
COMPONENT LOCATOR
CONTROL ASSEMBLY
(Left–Hand Drive Shown, Right–Hand Drive Similar)
D108A401
1. HVAC Control Assembly
2. Temperature Control Cable
3. Mode Select Cable
4. Rack
5. Bracket
6. Cable Clamp
7. Bulb Socket Assembly
8. Pinion Assembly
9. A/C Switch
10. Housing
11. Detent Cap12. Detent Spring
13. Blower Switch
14. Rear Defogger Switch
15. Recirculating/Fresh Air Door Cable
16. Panel
17. A/C Push Knob
18. Rotary Knob
19. Recirculating Knob
20. Rear Defogger Push Knob
21. Recirculation
Page 754 of 1184
7A–4 HEATING AND VENTILATION SYSTEM
DAEWOO M-150 BL2
BLOWER MODULE ASSEMBLY
(Left–Hand Drive Shown, Right–Hand Drive Similar)
D18A402A
1. Blower Module Assembly
2. Plastic Washer
3. Blower Link
4. Blower Lever
5. Air Intake Case
6. Valve Retainer
7. Heater Duct Assembly
8. Blower Connector Duct9. Orifice Case
10. Cable Clamp
11. Blower Valve
12. Blower Resistor
13. Lower Case
14. Cooling Hose
15. Blower Motor
Page 755 of 1184
HEATING AND VENTILATION SYSTEM 7A–5
DAEWOO M-150 BL2
AIR DISTRIBUTOR AND HEATER MODULE ASSEMBLY
(Left–Hand Drive Shown, Right–Hand Drive Similar)
D108A403
1. Defroster Duct Hose
2. Defroster Duct
3. Ventilation Duct
4. Heater Module Assembly
5. Plastic Washer
6. Temperature Control Lever
7. Temperature Control Lever Bearing
8. Defroster Link
9. Defroster Lever
10. Spring
11. Ventilation Link
12. Ventilation Lever13. Temperature Control Link
14. Heater Link
15. Heater Lever
16. Cable Link
17. Left Heater Case
18. Defroster Valve
19. Ventilation Valve
20. Temperature Control Valve
21. Right Heater Case
22. Case Seal
23. Heater Core Cover
24. Heater Core
Page 756 of 1184
7A–6 HEATING AND VENTILATION SYSTEM
DAEWOO M-150 BL2
DIAGNOSTIC INFORMATION AND PROCEDURES
HEATER SYSTEM
INSUFFICIENT HEATING OR DEFROSTING
Caution: The cooling system is pressurized when hot. Injury can result from removing the surge tank cap
before the engine is sufficiently cool.
Step Action Value(s) Yes No
1
Verify the customer’s complaint.
Are the customer’s concerns verified?
–
Go to Step 2
System OK
2 Check the coolant level.
Is the coolant level correct? – Go to Step 4 Go to Step 3
3
Add coolant as needed.
Is the repair complete?
–
System OK
Go to Step 4
4
Check the timing belt for tension or damage.
Is the timing belt OK?
–
Go to Step 6
Go to Step 5
5
Correct any problem with the drive belts.
Is the repair complete?
–
System OK
Go to Step 6
6
Check the coolant hoses for leaks or kinks.
Are the coolant hoses OK?
–
Go to Step 8
Go to Step 7
7 Repair any problem with the coolant hoses.
Is the repair complete? –
System OK
Go to Step 8
8
Check the surge tank cap. Refer to Section 1D,
Engine Cooling.
Is the surge tank cap OK?
–
Go to Step 10
Go to Step 9
9
Repair or replace the surge tank cap as needed.
Is the repair complete?
–
System OK
Go to Step 10
10
1. Set the A/C switch OFF on vehicles equipped
with air conditioning.
2. Set the blower motor switch on 4.
3. Set the heater control to full hot.
4. Turn the ignition ON.
5. Check for airflow from the heater outlet.
Is there heavy airflow from the heater outlet?
–
Go to Step 11
Go to Step 25
11
Check for a change in the airflow at various blower
speeds.
Does the blower speed increase as the switch is
turned from 1 to 4?
–
Go to Step 12
Go to ‘‘Blower
Electrical’’
12
1. Set the A/C switch to OFF, on vehicles equipped
with air conditioning.
2. Set the temperature lever to full hot.
3. Set the blower motor switch on 4.
4. With the engine sufficiently cool, remove the
surge tank cap.
5. Start the vehicle and idle the engine.
6. Watch for the flow of the coolant.
Is the coolant flow visible?
–
Go to Step 14
Go to Step 13
Page 757 of 1184
HEATING AND VENTILATION SYSTEM 7A–7
DAEWOO M-150 BL2
Insufficient Heating or Defrosting (Cont’d)
Step Action Value(s) Yes No
13
1. Check for a
Restriction in the cooling system.
Failed water pump impeller.
Faulty thermostat.
2. Make repairs to the cooling system, as needed.
Are the repairs complete?
–
System OK
–
14
1. Check the vehicle for cold air leaks at the
Dash.
Heater cases.
Vents.
2. Check under the seat for obstructions.
3. Repair any leaks or obstructions.
Are the repairs complete?
–
System OK
–
15
1. Turn the ignition OFF.
2. Turn the temperature control knob to full cold,
then rapidly to full hot.
3. Listen for the sound of the temperature door slam
just before reaching the end of the travel range of
the control knob.
Did the door slam?
–
Go to Step 17
Go to Step 16
16
1. Check the temperature door
Travel.
Cables.
Linkage.
2. Verify the accuracy of the temperature controls at
full hot.
3. Verify the accuracy of the temperature controls at
full cold.
Is the repair complete?
–
System OK
–
17
1. Set the temperature door to full hot.
2. Start the vehicle.
3. Check the temperature of the heater inlet hose
and the heater outlet hose by feel.
Is the heater inlet hose hot and the heater outlet
hose warm?
–
Go to Step 18
Go to Step 21
18
Check the thermostat. Refer to Section 1D, Engine
Cooling.
Is the thermostat installed and seated properly?
–
Go to Step 19
Go to Step 20
19
Replace the thermostat. Refer to Section 1D, Engine
Cooling.
Is the repair complete?
–
System OK
–
20
Reinstall the thermostat.
Is the repair complete?
–
System OK
–
21
Inspect the heater hoses for proper installation.
Are heater hoses reversed?
–
Go to Step 22
Go to Step 23
22
Reinstall the heater hoses properly.
Is the repair complete?
–
System OK
–
Page 758 of 1184
7A–8 HEATING AND VENTILATION SYSTEM
DAEWOO M-150 BL2
Insufficient Heating or Defrosting (Cont’d)
Step Action Value(s) Yes No
23
1. Back flush the heater core.
2. Drain the cooling system.
3. Replace the coolant.
4. Warm the engine to an average operating
temperature.
5. Feel the heater inlet hose and the heater outlet
hose.
Is the heater inlet hose hot and the heater outlet
hose warm?
–
System OK
Go to Step 24
24
Replace the heater core.
Is the repair complete?
–
System OK
–
25
Recheck the system using the “Control
Settings/Correct Results” tests. Refer to ‘‘Improper
Air Delivery or No Mode Shift” in this section.
Is the repair complete?
–
System OK
Go to Step 26
26
Check for airflow from the defroster or the vent
outlets.
Is there high airflow from the defroster or the vent
outlets?
–
Go to Step 27
Go to Step 28
27
Adjust the heater door at the floor and the vent door
to get the proper airflow.
Is the repair complete?
–
System OK
–
28
Switch the mode knob to defrost.
Is the defroster airflow OK?
–
Go to Step 29
Go to Step 30
29
1. Remove the heater outlet and check for
obstructions.
2. Remove any obstructions in the heater outlet.
Is the repair complete?
–
System OK
–
30
Check for airflow change at various blower speeds.
Does the blower speed increase as the control is
turned from 1 to 4?
–
Go to Step 31
Go to ‘‘Blower
Electrical’’
31
Check for obstructions in the system at the blower
inlet.
Are there any obstructions?
–
Go to Step 32
Go to Step 33
32
Remove the obstructions in the system at the blower
inlet.
Is the repair complete?
–
System OK
–
33
1. Set the blower on 4.
2. Rotate the temperature control from full hot to full
cold.
3. Listen for an airflow change.
Does the airflow change?
–
Go to Step 34
Go to Step 35
Page 759 of 1184
HEATING AND VENTILATION SYSTEM 7A–9
DAEWOO M-150 BL2
Insufficient Heating or Defrosting (Cont’d)
Step Action Value(s) Yes No
34
1. Check the temperature door
Travel.
Cables.
Linkage.
Control.
2. Verify the accuracy of the temperature controls at
full hot.
Is the repair complete?
–
System OK
–
35
1. Check the system for any obstruction between
the blower and the system outlets.
2. Remove any obstruction.
Is the repair complete?
–
System OK
–
Page 760 of 1184
7A–10 HEATING AND VENTILATION SYSTEM
DAEWOO M-150 BL2
BLOWER ELECTRICAL
Step Action Value(s) Yes No
1
Verify the customer’s complaint.
Are the customer’s concerns verified.
–
Go to Step 2
System OK
2
Check the blower.
Does the blower run at any speed?
–
System OK
Go to Step 3
3
1. Disconnect the power connector from the blower
motor under the dashboard on the passenger side
of the vehicle.
2. Use an ohmmeter check the resistance between
the 1 terminal of the blower motor connector and
each step with the blower switch place each
position.
Does the ohmmeter show the specified value of the
each position?
Refer to
“Specifica-
tions” in this
section.
Go to Step 4
Go to Step 5
4
Replace the blower motor.
Is the repair complete?
–
System OK
Go to Step 7
5
Check the fuse Ef6.
Is the fuse blown?
–
Go to Step 6
Go to Step 7
6
1. Turn the ignition ON.
2. Use a short detector to locate a possible short.
From the fuse Ef6 to the blower switch.
From the blower swtich to the blower resistor.
From the blower resistor to the blower motor.
3. Repair any short.
4. Replace any blown fuse.
Is the repair complete?
–
System OK
–
7
1. Turn the ignition ON.
2. Disconnect the power connector from the blower
motor.
3. Use a test lamp to locate a possible short.
From the terminal 2 of the motor connector to
the terminal 3 of the motor switch connector.
From the terminal 2 of the motor connector to
the terminal 4 of the motor switch connector.
From the terminal 2 of the motor connector to
the terminal 5 of the motor switch connector.
From the terminal 2 of the motor connector to
the terminal 6 of the motor switch connector.
Does the test lamp light ON?
–
Go to Step 9
Go to Step 8
8
Replace the blower resistor.
Is the repair complete?
–
System OK
Go to Step 10
9
Replace the blower motor switch.
Is the repair complete?
–
System OK
–
10
1. Check the ground of the blower motor.
2. Repair the ground of the blower motor.
Is the repair complete?
–
System OK
–