Heating And Ventilating System Diagnosis; Insufficient Heating Or Defrosting - Daewoo Nubira Owner's Manual

7A – 4IHEATING AND VENTILATION SYSTEM
CAUTION : The cooling system is pressurized when hot. Injury can result from removing the surge tank cap be-
fore the engine is sufficiently cool.
Step
1 Verify the customer's complaint.
Are the customer's concerns verified?
2 Check the coolant level.
Is the coolant level correct?
3 Add coolant, as needed.
Is the repair complete?
4 Check the drive belts for tension or damage.
Are the drive belts OK?
5 Correct any problem with the drive belts.
Is the repair complete?
6 Check the coolant hoses for leaks or kinks.
Are the coolant hoses OK?
7 Repair any problem with the coolant hoses.
Is the repair complete?
8 Check the surge tank cap. Refer to Section 1D, En-
gine Cooling.
Is the surge tank cap OK?
9 Repair or replace the surge tank cap as needed.
Is the repair complete?
10
1. Turn the A/C OFF on vehicles equipped with
air conditioning.
2. Turn the blower motor switch to 4.
3. Turn the heater control to full hot.
4. Turn the ignition ON.
5. Check for airflow from the vent outlet.
Is there heavy airflow from the vent outlet?
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?
12
1. Turn the A/C OFF.
2. Turn the temperature control knob to full hot.
3. Turn the blower motor switch to 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?
DIAGNOSIS
HEATER SYSTEM

INSUFFICIENT HEATING OR DEFROSTING

Action Value(s) Yes
Go to Step 2
Go to Step 4
System OK
Go to Step 6
System OK
Go to Step 8
System OK
Go to Step 10
System OK
Go to Step 11
Go to Step 12
Go to Step 14
No
System OK
Go to Step 3
Go to Step 4
Go to Step 5
Go to Step 6
Go to Step 7
Go to Step 8
Go to Step 9
Go to Step 10
Go to Step 26
Go to "Blower
Electrical"
Go to Step 13
DAEWOO V–121 BL4