Daewoo Nubira. Manual — part 178
7A – 8
I
HEATING AND VENTILATION SYSTEM
DAEWOO V–121 BL4
Step
No
Yes
Value(s)
Action
7
1. Turn the ignition ON.
2. Turn the blower motor switch to 4.
3. Check the blower motor ground.
Is ground OK?
Go to Step 9
Go to Step 8
8
Repair the blower motor ground.
Is the repair complete?
System OK
9
Check the motor connector with a 12–volt test light.
Does the test light come on?
Go to Step 10
Go to Step 11
10
Repair the open in the feed wire from the resistor
block to the blower motor.
Is the repair complete?
System OK
11
Use the 12–volt test light to check the power feed
terminal on the blower speed switch.
Does the light come on?
Go to Step 12
Go to Step 13
12
Replace the blower speed switch.
Is the repair complete?
System OK
13
Repair the open in the power wire from the blower
speed switch to the fuse panel.
Is the repair complete?
System OK
14
Does the blower fail to operate at speed 4?
Go to Step 15
Go to Step 21
15
Check fuse EF2 in the engine fuse block.
Is the fuse blown?
Go to Step 16
Go to Step 17
16
1. Turn the ignition ON.
2. Turn the blower motor switch to 4.
3. Use a short detector to locate the following
possible shorts:
S
From the engine fuse panel to the blower
HI relay.
S
From the blower HI relay to the blower mo-
tor.
4. Repair any short.
5. Replace the EF2.
Is the repair complete?
System OK
17
1. Turn the ignition ON.
2. Turn the blower motor switch to 4.
3. Check for 12 volts on the blower HI relay coil
terminal from the blower speed switch terminal
A2.
Is this voltage present?
Go to Step 18
Go to Step 19
18
Replace the blower speed switch.
Is the repair complete?
System OK
19
1. Turn the ignition OFF.
2. Check for opens in the following locations:
S
Fuse EF2 to the blower HI relay.
S
Blower speed switch to the blower HI relay.
S
Blower HI relay to ground.
S
Blower HI relay to the blower motor.
3. Repair any opens.
Is the repair complete?
System OK
Go to Step 20
HEATING AND VENTILATION SYSTEM 7A – 9
DAEWOO V–121 BL4
Step
No
Yes
Value(s)
Action
20
Replace the blower HI relay.
Is the repair complete?
System OK
21
1. Disconnect the resistor block connector.
2. Connect one lead of a self–powered test light
to any single lead on the resistor block. Use
the other lead to probe each of the other two
terminals.
Does the test light illuminate on all terminals?
Go to Step 23
Go to Step 22
22
Replace the resistor block.
Is the repair complete?
System OK
23
1. Turn the ignition to LOCK.
2. Disconnect the connector from the resistor
block.
3. Connect a jumper lead from the positive termi-
nal on the battery to any wire terminal in the
connector.
4. Use a 12–volt test light to check for voltage
from the corresponding wire on the blower
speed switch.
5. Repeat the same test on the other wires.
Does the lamp light on all three wires?
Go to Step 25
Go to Step 24
24
Replace the blower speed switch.
Is the repair complete?
System OK
25
Repair the open in the affected wire.
Is the repair complete?
System OK
IMPROPER AIR DELIVERY OR NO MODE SHIFT
This procedure provides a test of all functions of the heater/defroster unit.
1. Warm up the vehicle.
2. Keep the engine running.
3. Perform the tests outlined in the table below and look for the results indicated.
CONTROL SETTINGS
CORRECT RESULTS
MODE
KNOB
TEMP.
CONTROL
BLOWER
MOTOR
SWITCH
BLOWER
SPEED
POWER
VENT
OUTLET
FLOOR
OUTLET
DEFROST
OUTLET
SIDE
WINDOW
OUTLET
Vent
Cold
Off
Off
No Airflow
No Airflow
No Airflow
No Airflow
Vent
Cold
4
High
Ambient
Airflow
No Airflow
No Airflow
No Airflow
Floor
Cold to Hot
4
High
No Airflow
Cold to Hot
Airflow
Minimum
Cold to Hot
Airflow
Minimum
Cold to Hot
Airflow
Defroster
Cold to Hot
4
High
No Airflow
Minimum
Cold to Hot
Airflow
Cold to Hot
Airflow
Minimum
Cold to Hot
Airflow
If any of these settings does not produce the correct results, perform the following diagnostic procedure.
7A – 10
I
HEATING AND VENTILATION SYSTEM
DAEWOO V–121 BL4
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
Examine the affected door in the unit for proper at-
tachment to the vacuum actuator.
S
Check the actuator connection to the door.
S
Check that the vacuum hose is connected
properly.
Is everything connected properly?
Go to Step 4
Go to Step 3
3
Repair, as necessary.
Is the repair complete?
System OK
4
1. Disconnect the actuator at the door.
2. Check the range of the door travel and the ef-
fort required to move it.
Does the door move freely through its entire range
of travel so that it can close at both ends of the
range?
Go to Step 5
Go to Step 3
5
Check the travel of the actuator by turning the con-
trol knob with the engine running.
Is the actuator travel OK?
Go to Step 6
Go to Step 7
6
1. Reinstall the actuator.
2. Recheck the system using the ”Control Set-
tings/Correct Results” tests in this procedure.
Does the system perform properly?
System OK
Go to Step 9
7
1. Check the vacuum hose at the control.
2. Check for a broken control.
Is there a problem with the vacuum hose or the con-
trol?
Go to Step 8
Go to Step 9
8
Repair the vacuum hose or control, as necessary.
Is the repair complete?
System OK
Go to Step 9
9
Recheck the system using the ”Control Settings/
Correct Results” tests in this procedure.
Is the repair complete?
System OK
Go to Step 10
10
Check for airflow from the defroster or the vent out-
lets.
Is there high airflow from the defroster or the vent
outlets?
Go to Step 11
Go to Step 12
11
Adjust the heater door at the floor and the vent door
to get the proper airflow.
Is the repair complete?
System OK
12
Turn the mode knob to defrost.
Is the defroster airflow OK?
Go to Step 13
Go to Step 14
13
1. Remove the heater outlet.
2. Check the heater outlet for obstructions.
3. Remove any obstructions in the heater outlet.
Is the repair complete?
System OK
14
Check the blower speeds fora change in the airflow.
Does the blower speed increase as the control is
turned from 1 to 4?
Go to Step 15
Go to ”Blower
Electrical”
HEATING AND VENTILATION SYSTEM 7A – 11
DAEWOO V–121 BL4
Step
No
Yes
Value(s)
Action
15
1. Check for obstructions in the system at the
blower inlet and check the air filter, if equipped.
2. Remove any obstructions at the blower inlet
and replace the filter if it is clogged.
Is the repair complete?
System OK
Go to Step 16
16
1. Turn the blower motor switch to 4.
2. Turn the temperature control knob from full hot
to full cold.
3. Listen for an airflow change.
Does the airflow change?
Go to Step 17
Go to Step 18
17
1. Check the temperature door, the cable, the
linkage, and the control.
2. Turn the temperature control knob to full hot.
Is the repair complete?
System OK
18
1. Check the system for any obstruction between
the blower and the system outlets.
2. Remove any obstruction between the blower
and the system outlets.
Is the repair complete?
System OK
TOO MUCH HEAT
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
Is there too much heat when the mode switch is in
the floor position?
Go to Step 3
Go to Step 9
3
Is there objectionable defroster bleed?
Go to Step 4
Go to Step 5
4
1. Check the door travel, the cable, the vacuum
actuators, and the linkage for the heater and
the defroster.
2. Adjust or repair, as required.
Is the repair complete?
System OK
5
1. Turn the A/C OFF on vehicles equipped with
A/C.
2. Turn the blower motor switch to 4.
3. Turn the temperature to full hot.
4. Turn the ignition ON.
5. Start the engine.
6. Check for airflow from the floor outlets.
7. Check the floor outlet attachment.
Is the airflow high?
Go to Step 6
Go to Step 8
6
Check for a change in the airflow at different blower
speeds.
Does the airflow change as the setting for the blower
motor speed switch is changed?
Go to Step 7
Go to ”Blower
Electrical”
7
1. Check the temperature door travel, the cable,
and the linkage.
2. Turn the temperature control knob to full cold.
3. Check for full hot.
Is the repair complete?
System OK
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