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1 A-
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1 9 7 7 PONTIAC SERVICE M A N U A L
GENERAL DESCRIPTION
HEATER CONTROL FUNCTIONAL
TEST
(A, F, G SERIES)
Functional tests are to be made with engine running off
fast idle speed cam with choke open and coolant warm.
I. Move Air Control (mode) lever to OFF, set fan switch
to HI position and move temperature lever to full HOT.
0
Blower operates with all air coming out purge opening
at R H end of heater case.
2. Move Air Control (mode) lever to HEATER. Make
sure lever is engaged in detent.
0
Hot air comes chiefly from heater outlet, with some
air from defroster nozzles.
3. Move Air Control (mode) lever to DEFROST.
0
Hot air comes chiefly from defroster nozzles, with
some air from heater outlet.
4. Move temperature lever to full COLD.
0
Air from defroster is about the same temperature as
the air outside the car.
5. Move the fan switch to LO, pausing at each detent.
0
Blower speed and air flow decrease at each detent until
low speed is obtained.
6 .
Move Air Control (mode) lever to OFF.
0
Blower continues to run at low speed but all air comes
out purge opening at R.H. end of heater case.
B SERIES
The engine should be idling off fast idle speed cam with
choke open, coolant hot and the thermostat open (195°F. or
91°C.). The heater vent control mode lever and temperature
lever efforts must be checked. These efforts should not be too
low (below 2 Ib. using pull-scale) or too high (above 6.5 Ib.)
or repair/ adjustment then be made.
1. Close all vent doors and set Air Control (mode) lever
to VENT mode, full COLD temperature lever position and
H I blower.
0
Air comes mainly from heater outlet with some air also
from defroster nozzle. The air temperature should be the
same as air outside the vehicle.
2. Pull the L H vent control open.
0
Some air comes from LH end of heater module (LH
vent outlet) and some air comes from heater outlet.
3. Push LH vent control closed and set temperature lever
to full HOT position. Note effort requirements above.
0
A reduced quantity of air (as compared to Step 2)
comes mainly from heater outlet. The air temperature should
now be hot (130°F. or 54°C.).
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rHlS POSITION ALLOWS OUTSIDE AIR
POSITION OF THIS SYSTEM SELECTOR
THIS POSITION ALLOWS
i N T R Y UNDER THE INSTRUMENT
LEVER DETERMINES AIR FLOW FROM
ABOUT 80% AIR FLOW
JANEL T H R U A PURGE OPENING A T
PURGE OPENING, FLOOR OR WINDSHIELD
T O WINDSHIELD & 20%
3IGHT SIDE OF HEATER CASE.
OUTLETS-IN "HEATER," FLOW IS ABOUT
T O FLOOR.
\
80% TO FLOOR
&
20% TO WINDSHIELD.
\
RUN ON "LO"
SPEED WHEN
SYSTEM SELECTOR
LEVER IS MOVED
TO "OFF" AS LONG
AS IGNITION IS
I N "RUN" POSITION.
REGULATE OUTLET AIR TEMPERATURE
BY BLENDING THE INCOMING OUTSIDE
AIR THRUIAROUND THE HEATER CORE.
FIG. 1A-1 1977 A &
G
SERIES HEATER CONTROL
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