1977 B Series Heater Air Flow - Pontiac TRANS AM 1977 Service Manual

HEATING AND VENTILATION 1 A-7
B
SERIES
VENT M O D E
-
UNTEMPERED AIR FLOW TO FLOOR OUTLET
(ADDITIONAL UNTEMPERED IOUTSIDE AIR FLOW CAN BE
GAINED BY OPERATION OF,CENTER UPPER I/P, LEFT OR
TEMP. VALVE (DOOR) CLOSED &
RIGHT SIDE VENT KNOBS.)
I N FRONT OF HEATER CORE
SHUT-OFF VALVE
(DOOR) CLOSES OFF
HEATER
CORE AIR
FLOW PASSAGE
UNDER I/P
.
-
.OWER MOTOR
FLOOR
OUTLET CENTER UPPER
-
-
I/P VENT OUTLET : ~ , " y g T OUTLET
H E A T M O D E
-AIR FLOW TEMPERED
BY HEATER CONTROL TEMP. LEVER
TEMP. VALVE (DOOR) OPENED
/
WINDSHIELD
SHUT-OFF VALVE
(DOOR) I N SAME
POSITION AS IN
"DEFROST"
DEFROST M O D E
- A I R FLOW TEMPERED
BY HEATER CONTROL TEMP. LEVER
SHUT-OFF VALVE (DOOR
LVE
DOOR)
OPENED
NOT CLOSING OFF HEA
AIR PASSAGE
WINDSHIELD OUTLET/.
SHUT-OFF VALVE (DOOR)
FLOOR OUTLE
NOW CLOSING OFF BY-PASS
CLOSE A& VENT VALVES
FIG. 1A-9 1977 B SERIES HEATER AIR FLOW