Pontiac Fiero 1988 Service Manual page 37

1A-12 HEATING AND VENTILATION
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CHECK FOR MOTOR & FAN VIBRATION AT EACH BLOWER
SPEED BY FEELING THE BLOWER ARMATURE.
X
NO EXCESS VIBRATION VIBRATION EXCESSIVE
REMOVE BLOWER MOTOR & FAN
ASSEMBLY AND CHECK FOR
FOREIGN MATERIAL AT THE
ORIFICE OF BLOWER INLET.
PROBLEM FOUND
1
NONE FOUND
REPAIR/REPLACE
AS NECESSARY
AND RECHECK
ON HIGH BLOWER, CHECK
FULL HOT TO FULL COLD
TEMPERATURE POSITIONS
IN DEFROST, HEATER
AND VENT MODES.
NOISE IN
DEFROSTER
MODE ONLY
EXAMINE BLOWER FAN FOR WEAR
SPOTS, CRACKED BLADES OR
HUB, LOOSE FAN RETAINING
NUT AND ALIGNMENT. EXAMINE
BLOWER CASE FOR WEAR SPOTS.
£
PROBLEM FOUND
T
NONE FOUND LUBRICATE MOTOR
i _ _
PROBLEM STILL EXISTS
REPAIR/REPLACE
AS NECESSARY
AND RECHECK
REPLACE MOTOR AND FAN
ASSEMBLY AND RECHECK
PROBLEM STILL EXISTS
IF NOISE IS A CLICK/TICK OR
WHINE, TRY A SECOND NEW
MOTOR, THEN PROCEED.
REINSTALL ORIGINAL MOTOR
AND PROCEED TO < ^ > ABOVE
(NOISE IS CONSTANT . . .)
NOISE IN
HEATER
MODE ONLY
NOISE IN
VENT MODE
ONLY
I
NOISE IN
ALL MODES
BUT NOT ALL
TEMPERATURE
POSITIONS
NOISE IN ALL
MODES AND
IN ALL
TEMPERATURE
POSITIONS
CHECK DUCTS FOR
OBSTRUCTIONS OR
FOREIGN MATERIALS
AND REMOVE. CHECK
HEATER/DEFROSTER
DOOR SEALS.
REPAIR/REPLACE AS
NECESSARY AND RE-
CHECK.
CHECK DUCTS FOR
OBSTRUCTIONS
OR FOREIGN
MATERIALS AND
REMOVE. CHECK
VENT DOOR
SEALS. REPAIR/
REPLACE AS
NECESSARY AND
RECHECK.
CHECK TEMPERA-
TURE DOOR
SEALS. REPAIR/
REPLACE AS
NECESSARY AND
RECHECK.
CHECK SYSTEM
FOR OBSTRUC-
TIONS OR FOREIGN
MATERIALS BE-
TWEEN THE FAN
AND THE TEMPER-
ATURE DOOR.
REMOVE, REPAIR
OR REPLACE AS
NECESSARY AND
RECHECK.
G 2 0 0 1 0 - 1 A
Figure 13 Blower Noise Diagnosis (2 of 2)