HEATING AND VENTILATION SYSTEM 7A – 7
DAEWOO V–121 BL4
Step NoYesValue(s)Action
34
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 35 Go to Step 36
35
1. Check the following aspects of the temperature
door:
S Travel.
S Cables.
S Linkage.
S Control.
2. Verify the accuracy of the temperature control
at full hot.
Is the repair complete?
Go to Step 1
36
1. Check the system for any obstruction between
the blower and the system outlets.
2. Remove any obstruction.
Is the repair complete?
Go to Step 1
BLOWER ELECTRICAL
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 Does the blower run at any speed? Go to Step 14 Go to Step 3
3
1. Disconnect the power connector from the blow-
er motor under the dashboard on the passen-
ger’s side of the vehicle.
2. Turn the ignition ON.
3. Turn the blower ON.
4. Test the voltage on the connector. The terminal
connected to the PPL wire is positive and the
terminal connected to the BLK wire is negative.
Is this voltage within the specified range?
11–14 v Go to Step 4 Go to Step 5
4 Replace the blower motor.
Is the repair complete?
System OK
5 Check fuse EF2 in the engine fuse block.
Is the fuse blown?
Go to Step 6 Go to Step 7
6
1. Turn the ignition ON.
2. Use a short detector to locate the following
possible shorts:
S From the fuse panel to the blower speed
switch.
S From the blower speed switch to the heater
resistor block.
S From the heater resistor block to the blow-
er motor.
S From the blower speed switch to the blower
HI relay.
3. Repair any short.
4. Replace any blown fuse.
Is the repair complete?
System OK
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