7A – 10IHEATING 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”
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