2003 DAEWOO MATIZ heating system

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.

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

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

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

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

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

–

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

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



–