Daewoo MATIZ Service Manual page 757

Step
1. Check for a
D Restriction in the cooling system.
D Failed water pump impeller.
13
D Faulty thermostat.
2. Make repairs to the cooling system, as needed.
Are the repairs complete?
1. Check the vehicle for cold air leaks at the
D Dash.
D Heater cases.
D Vents.
14
2. Check under the seat for obstructions.
3. Repair any leaks or obstructions.
Are the repairs complete?
1. Turn the ignition OFF.
2. Turn the temperature control knob to full cold,
then rapidly to full hot.
15
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?
1. Check the temperature door
D Travel.
D Cables.
D Linkage.
16
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?
1. Set the temperature door to full hot.
2. Start the vehicle.
3. Check the temperature of the heater inlet hose
17
and the heater outlet hose by feel.
Is the heater inlet hose hot and the heater outlet
hose warm?
Check the thermostat. Refer to Section 1D, Engine
Cooling.
18
Is the thermostat installed and seated properly?
Replace the thermostat. Refer to Section 1D, Engine
Cooling.
19
Is the repair complete?
Reinstall the thermostat.
20
Is the repair complete?
Inspect the heater hoses for proper installation.
21
Are heater hoses reversed?
Reinstall the heater hoses properly.
22
Is the repair complete?
DAEWOO M-150 BL2
Insufficient Heating or Defrosting (Cont'd)
Action
HEATING AND VENTILATION SYSTEM 7A – 7
Value(s)
–
–
–
Go to Step 17
–
–
Go to Step 18
–
Go to Step 19
–
–
–
Go to Step 22
–
Yes No
–
System OK
–
System OK
Go to Step 16
–
System OK
Go to Step 21
Go to Step 20
–
System OK
–
System OK
Go to Step 23
–
System OK