HEATING AND VENTILATION SYSTEM 7A – 9
DAEWOO V–121 BL4
Step NoYesValue(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.
To Next Page
Loading...
Need help?
General
