Pontiac Fiero 1988 Service Manual page 30

HEATING AND VENTILATION 1A-5
O INSUFFICIENT HEATING OR D E F R O S T I N G
CHECK THE COOLANT L E V E L , BELTS, BELT TENSION, H O S E S FOR LEAKS OR
KINKS, RADIATOR CAP
ADJUST THE HEATER CONTROLS TO: HEATER MODE, HIGH BLOWER S P E E D ,
TEMPERATURE LEVER TO FULL HOT.
WITH THE IGNITION SWITCH ON, C H E C K FOR AIRFLOW OUT OF THE HEATER
OUTLET & CHECK OUTLET ATTACHMENT
_L
HIGH AIRFLOW
1
LOW OR NO AIRFLOW
C H E C K BLOWER S P E E D S
FOP AIRFLOW CHANGE
S P E E D CHANGE
NO S P E E D
CHANGE
NO S P E E D
CHANGE
RUN FUNCTIONAL C H E C K PER SECTION
/ 3 >
IF PROBLEM NOT RESOLVED THEN
CHECK FOR AIRFLOW OUT DEFROSTER
OR VENT OUTLETS
HIGH AIRFLOW OUT
DEFROSTER OR VENT
OUTLETS
LOW OR NO AIRFLOW
O U T—BE FROST-BR—OR-
VENT OUTLETS
ADJUST HEATER D E F R O S T E R
AND/OR VENT DOOR TO HEATER
MODE
SWITCH MODE LEVER
TO D E F R O S T E R &
CHECK AIRFLOW
READJUST CONTROLS TO: HIGH BLOWER SPEED,
HEATER MODE, FULL HOT TEMPERATURE LEVER.
WITH THE ENGINE SUFFICIENTLY COOL, REMOVE THE
RADIATOR CAP. CAUTION: COOLANT SYSTEM IS PRES-
SURIZED WHEN HOT. START THE VEHICLE AND IDLE
UNTIL COOLANT FLOW IN THE RADATOR IS VISIBLE.
INSTALL THE RADIATOR CAR WITH ENGINE WARM,
DRIVE THE VEHICLE AT 48 KPHpOMPH). WITH A THER-
MOMETER, CHECK THE AMBIENT AIR TEMPERATURE
&THE DISCHARGE AIR TEMPERATURE AT THE HEATER
OUT LET PER CHART (TOTAL WARM UP TIME 20 MIN)
AMBIENT AIR TEMP. °C (F)
HEATER AIR TEMP. °C (F)
-18(0)
54(130)
-4(25)
59(139)
10(50)
64(147]
24(75)
68(155)
HEATER TEMPERATURE
OK PER CHART
HEATER TEMPERATURE
LOW PER CHART
©
DEFROSTER
LOW OR NONE
REMOVE
HEATER OUT-
LET & CHECK
FOR OB-
STRUCTIONS
CHECK BLOWER
S P E E D S FOR
AIRFLOW
CHANGE
NO S P E E D
CHANGE
T
SPEED CHANGE
OK
CHECK FOR SYSTEM
OBSTRUCTIONS AT
BLOWER INLET &
PLENUM
CONTINUED AT TOP OF NEXT PAGE
G 2 0 0 2 4 1 A
Figure 6 Insufficient Heating or Defrosting Diagnosis Procedure (1 of 2)