Pontiac FIREBIRD 1972 Service Manual page 23

1-2 1972 PONTIAC SERVICE MANUAL
-L
-
u
RESISTOR
BLOWER
BLOCK
MOTOR
; i
B L A C K - - ,
RESISTOR VALUES
A
B
.87 1.97
&
CONTROL
I
:@
RED
WHITE
I
I
BROWN
1
DIAL LIGHT
1
(
FUSE BLOCK
1
Fig. 1-2 Heater Wiring Schematic
- A, G and F Series
HEATER TROUBLE DIAGNOSIS
INSUFFICIENT HEATING
CAUSE
Slow warming in car.
Objectionable engine or exhaust fumes in car.
Cold drafts on floor.
Insufficient heat to rear seat.
CORRECTION
Incorrect operation of controls. Advise operator of
proper operation of heater controls. Explain
operation of cowl vents and controls.
Low coolant level.
Check control cable and blower operation.
Check for seal between engine compartment and
plenum.
Check for proper sealing between air inlet duct
assembly and dash.
Locate and seal any other air leaks.
Check operation and adjustment of vent cables.
Advise operator of proper operation of
heater system.
Advise operator to use blower to force
air to rear seat area.
Check to be sure front floor mat is under
floor mat retainer at dash.
Obstruction on floor, possibly wrinkled or torn