7A–16 HEATING AND VENTILATION SYSTEM
DAEWOO M-150 BL2
BLOWER NOISE
Step
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Action
Value(s)
Yes
No
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1
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Verify the customer’s complaint.
Are the customer’s concerns verified?
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Go to Step 2
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System OK
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2
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1. Sit inside the vehicle.
2. Close the doors and windows.
3. Turn the ignition ON.
4. Set the blower speed to 4.
5. Set the temperature 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?
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Go to Step 11
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Go to Step 3
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3
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Check for vibrations from the blower motor and fan
assembly at each blower speed by feeling the
blower motor housing.
Did you find excessive vibration?
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Go to Step 6
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Go to Step 4
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4
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1. Remove the blower motor and fan assembly.
Refer to ‘‘Blower Motor” in this section.
2. Check for foreign material at the opening of the
blower inlet.
Did you find any foreign material at the blower inlet?
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Go to Step 5
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Go to Step 6
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5
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Remove all foreign material.
Is the repair complete?
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System OK
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Go to Step 6
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6
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1. Examine the blower fan for wear spots, cracked
blades, a cracked hub, a loose fan retaining nut,
or bad alignment.
2. Examine the blower case for wear spots.
Did you find any problem?
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Go to Step 7
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Go to Step 9
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7
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Lubricate the motor.
Is the repair complete?
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System OK
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Go to Step 8
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8
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Replace the motor and fan assembly.
Is the repair complete?
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System OK
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Go to Step 9
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9
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If the noise is a click/tick or whine, replace the mo-
tor.
Is the repair complete?
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System OK
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Go to Step 10
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10
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Reinstall the original motor.
Is the problem still present?
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Go to Step 11
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System OK
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11
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1. Set the blower speed on 4.
2. Check full-hot to full-cold temperature positions in
the defrost, floor, and vent modes.
Is the noise present in the defrost mode only?
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Go to Step 12
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Go to Step 13
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12
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1. Check the ducts for obstructions or foreign
materials.
2. Remove any obstructions or foreign materials.
3. Check floor/defroster door seals.
4. Repair or replace, as needed.
Is the repair complete?
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System OK
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13
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Is the noise present in the floor mode only?
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Go to Step 12
Go to Step 14