Daewoo Matiz (2003 year). Manual - part 187

7A – 6 HEATING AND VENTILATION SYSTEM

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.

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Step

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Action

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Value(s)

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Yes

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Verify the customer’s complaint.
Are the customer’s concerns verified?

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Go to Step 2

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System OK

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Check the coolant level.
Is the coolant level correct?

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Go to Step 4

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Go to Step 3

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Add coolant as needed.
Is the repair complete?

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System OK

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Go to Step 4

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Check the timing belt for tension or damage.
Is the timing belt OK?

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Go to Step 6

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Go to Step 5

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Correct any problem with the drive belts.
Is the repair complete?

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System OK

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Go to Step 6

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Check the coolant hoses for leaks or kinks.
Are the coolant hoses OK?

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Go to Step 8

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Go to Step 7

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Repair any problem with the coolant hoses.
Is the repair complete?

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System OK

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Go to Step 8

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Check the surge tank cap. Refer to Section 1D,
Engine Cooling.
Is the surge tank cap OK?

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Go to Step 10

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Go to Step 9

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Repair or replace the surge tank cap as needed.
Is the repair complete?

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System OK

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Go to Step 10

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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?

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Go to Step 11

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Go to Step 25

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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?

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Go to Step 12

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Go to ‘‘Blower

Electrical’’

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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?

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Go to Step 14

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Go to Step 13

HEATING AND VENTILATION SYSTEM 7A – 7

Insufficient Heating or Defrosting (Cont’d)

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Step

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Action

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Value(s)

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Yes

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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?

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System OK

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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?

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System OK

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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?

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Go to Step 17

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Go to Step 16

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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?

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System OK

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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?

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Go to Step 18

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Go to Step 21

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Check the thermostat. Refer to Section 1D, Engine
Cooling.
Is the thermostat installed and seated properly?

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Go to Step 19

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Go to Step 20

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Replace the thermostat. Refer to Section 1D, Engine
Cooling.
Is the repair complete?

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System OK

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Reinstall the thermostat.
Is the repair complete?

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System OK

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Inspect the heater hoses for proper installation.
Are heater hoses reversed?

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Go to Step 22

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Go to Step 23

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Reinstall the heater hoses properly.
Is the repair complete?

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System OK

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7A – 8 HEATING AND VENTILATION SYSTEM

Insufficient Heating or Defrosting (Cont’d)

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Step

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Action

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Value(s)

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Yes

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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?

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System OK

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Go to Step 24

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Replace the heater core.
Is the repair complete?

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System OK

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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?

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System OK

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Go to Step 26

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Check for airflow from the defroster or the vent
outlets.
Is there high airflow from the defroster or the vent
outlets?

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Go to Step 27

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Go to Step 28

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Adjust the heater door at the floor and the vent door
to get the proper airflow.
Is the repair complete?

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System OK

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Switch the mode knob to defrost.
Is the defroster airflow OK?

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Go to Step 29

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Go to Step 30

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1. Remove the heater outlet and check for

obstructions.

2. Remove any obstructions in the heater outlet.
Is the repair complete?

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System OK

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Check for airflow change at various blower speeds.
Does the blower speed increase as the control is
turned from 1 to 4?

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–

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Go to Step 31

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Go to ‘‘Blower

Electrical’’

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Check for obstructions in the system at the blower
inlet.
Are there any obstructions?

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–

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Go to Step 32

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Go to Step 33

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Remove the obstructions in the system at the blower
inlet.
Is the repair complete?

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System OK

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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?

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–

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Go to Step 34

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Go to Step 35

HEATING AND VENTILATION SYSTEM 7A – 9

Insufficient Heating or Defrosting (Cont’d)

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Step

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Action

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Value(s)

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Yes

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1. Check the temperature door

Travel.

Cables.

Linkage.

Control.

2. Verify the accuracy of the temperature controls at

full hot.

Is the repair complete?

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–

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System OK

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1. Check the system for any obstruction between

the blower and the system outlets.

2. Remove any obstruction.
Is the repair complete?

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System OK

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