Daewoo Nubira. Manual - part 179

7A – 12

I

HEATING AND VENTILATION SYSTEM

DAEWOO V–121 BL4

Step

No

Yes

Value(s)

Action

8

Adjust or repair the floor/defroster and/or the vent/
floor mode.
Is the repair complete?

System OK

9

Is there objectionable vent bleed?

Go to Step 10

Go to Step 15

10

1.  Check the system case for leaks.
2.  Check the floor outlet attachment.

Are there problems?

Go to Step 11

Go to Step 12

11

Repair the system case or the floor outlet attach-
ment, as required.
Is the repair complete?

System OK

Go to Step 12

12

1.  Turn the ignition OFF.
2.  Turn the temperature control knob from full hot

to full cold.

3.  Listen for the sound of the temperature door

slam just before reaching the end of the travel
range at the control knob.

Does the door slam?

Go to Step 13

Go to Step 14

13

Adjust the vent door to allow more ventilation.
Is the repair complete?

System OK

14

1.  Check the temperature door travel, the cable,

and the linkage.

2.  Verify that the temperature door goes to full

cold.

3.  Check the temperature door for full hot.

Is the temperature door travel correct?

System OK

15

1.  Turn the fresh air/recirculating air control to

fresh air (indicator lamp OFF).

2.  Turn the temperature control knob to full cold.
3.  Start the vehicle and allow the engine to warm

up.

4.  Measure the air temperature at the blower in-

let, or cowl, and at the vent air outlet inside the
vehicle.

Is the outlet air more than 5

°

C (41

°

F) warmer than

the inlet air?

Go to Step 16

System OK

16

1.  Check for hot air leaks from the engine

compartment to the blower inlet.

2.  Repair, as needed.

Is the repair complete?

System OK

 

HEATING AND VENTILATION SYSTEM  7A – 13

DAEWOO V–121 BL4

CONTROLS

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

Move the controls other than the temperature ad-
justment.
Is excessive effort required to move the controls?

Go to Step 15

Go to Step 3

3

Move the temperature control knob.
Is excessive effort required to move the control
knob?

Go to Step 6

Go to Step 4

4

Turn the blower motor control switch to 4.
Does the temperature door move too easily?

Go to Step 5

System OK

5

Remove the cable from the controller.
Does the control knob turn freely, without the click
stops?

Go to Step 15

6

Check the cables for improper routing, kinks, wiring
interference, or other instrument panel interference.
Is there a problem?

Go to Step 7

Go to Step 8

7

Repair, as needed.
Is the repair complete?

System OK

8

1.  Remove the cable from the temperature door.
2.  Cycle the door manually.
3.  Check for door binding.

Is there any door binding?

Go to Step 9

Go to Step 12

9

Check the door seal for proper installation.
Is the door seal OK?

Go to Step 10

Go to Step 11

10

1.  Check a binding door for shaft alignment, a

bent shaft, a bent door, or a warped case.

2.  Repair, as needed.

Is the repair complete?

System OK

11

Repair the door seal, as needed.
Is the repair complete?

System OK

12

Check for control binding.
Does the control bind?

Go to Step 14

Go to Step 13

13

1.  Reinstall the cable to the door.
2.  Check the clearance for the cable–to–dash

components.

3.  Repair any interference.

Is the repair complete?

System OK

14

1.  Remove the cable from the control.
2.  Check the control for binding.

Does the control bind?

Go to Step 15

Go to Step 16

15

Replace the control.
Is the repair complete?

System OK

16

Replace the cable.
Is the repair complete?

System OK

 

7A – 14

I

HEATING AND VENTILATION SYSTEM

DAEWOO V–121 BL4

BLOWER NOISE

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

1.  Sit inside the vehicle.
2.  Close the doors and the windows.
3.  Turn the ignition ON.
4.  Start the engine.
5.  Turn the temperature control knob to full cold.
6.  Cycle through the blower speeds, the modes,

and the temperature settings in order to find
the noise.

Is the blower noise constant at high blower speeds
or certain modes, but absent at lower speeds or in
other modes?

Go to Step 11

Go to Step 3

3

Check for vibrations from the blower motor and fan
assembly at each blower speed by feeling the blower
motor housing.
Is there excessive vibration?

Go to Step 6

Go to Step 4

4

1.  Remove the blower motor and the fan assem-

bly. Refer to  ”Blower Motor” in this section.

2.  Check for foreign material at the opening of the

blower inlet.

Is there any foreign material at the blower inlet?

Go to Step 5

Go to Step 6

5

Remove all foreign material.
Is the repair complete?

System OK

Go to Step 6

6

1.  Examine the blower fan for wear spots,

cracked blades, a cracked hub, a loose fan re-
taining nut, or bad alignment.

2.  Examine the blower case for wear spots.

Are there any problems?

Go to Step 7

Go to Step 9

7

Repair, as required.
Is the repair complete?

System OK

Go to Step 8

8

Replace the motor and the fan assembly.
Is the repair complete?

System OK

Go to Step 9

9

If the noise is a click, tick or whine, replace the motor.
Is the repair complete?

System OK

Go to Step 10

10

Reinstall the original motor.
Is the problem still present?

Go to Step 11

System OK

11

1.  Turn the blower motor switch to 4.
2.  Check full hot to full cold temperature positions

in the defrost, the floor, and the vent modes.

Is the noise present in the defrost mode only?

Go to Step 12

Go to Step 13

12

1.  Check the ducts for obstructions or foreign ma-

terials.

2.  Remove any obstructions or foreign materials.
3.  Check the floor/defroster door seals.
4.  Repair or replace, as needed.

Is the repair complete?

System OK

13

Is the noise present in the floor mode only?

Go to Step 12

Go to Step 14

14

Is the noise present in the vent mode only?

Go to Step 15

Go to Step 16

HEATING AND VENTILATION SYSTEM  7A – 15

DAEWOO V–121 BL4

Step

No

Yes

Value(s)

Action

15

1.  Check the ducts for obstructions or foreign ma-

terials.

2.  Remove any obstructions or foreign materials.
3.  Check the vent door seals.
4.  Repair or replace, as needed.

Is the repair complete?

System OK

16

Is the noise present in all modes, but not all tempera-
ture positions?

Go to Step 17

Go to Step 18

17

1.  Check the temperature door seals.
2.  Repair or replace, as needed.

Is the repair complete?

System OK

18

1.  Check the system for obstructions or foreign

materials between the fan and the temperature
door.

2.  Repair or replace, as needed.

Is the repair complete?

System OK

Go to Step 2