Heating And Ventilation Service; Temperature Cable Adjust; Air Control Cablgadjust; Pontiac, Tempest And Flreblrd - Pontiac Grand Prix Service Manual

H E A T I N G AND VENTILATION
SUBJECT
SERVICE
CONTENTS OF THIS SECTION
PAGE SUBJECT
Temperature Cable Adjust
. . . . . . . . . . .
1- 1
A i r
Control Cable Adjust
. . . . . . . . . . .
1-1
Heater Control Panel.
. . . . . . . . . . . . .
1- 1
Blower Motor Resistor.
. . . . . . . . . . . .
1-4
Heater Wiring Harness.
. . . . . . . . . . . .
1-4
Temperature Control Cable
. . . . . . . . . .
1-5
A i r
Coctrol or Defroster Cable
. . . . . . . .
1-5
Defroster Diaphragm and Hose
. . . . . . . .
1-6
A i r
Diaphragm and Hose.
. . . . . . . . . . .
1-6
GENERAL INFORMATION
All 1969 heater systems receive air through the grille
(or opening) at the rear of the hood. This air passes
through the plenum chamber into the heater motor
inlet duct and then through the heater core and case
where further air distribution is controlled by three
doors.
Service and adjustment procedures for Pontiac, Tem-
pest, Grand Prix and Firebird Heating and Ventilation
Systems are covered in the following sections.
TEMPERATURE CABLE ADJUST
PONTIAC AND GRAND PRlX
PAGE
I
Vacuum Supply Hose
. . . . . . . . . . . . . .
1-6
Blower Motor, Impeller and/or Inlet
. . . . . . . . . . . . . . . . . . . .
D u c t . .
1-6
Heater Core and/or Case
. . . . . . . . . . .
1-7
Heater Hose Inlet and Outlet
. . . . . . . . .
1-9
. . . . . . . . . . . . . . . . .
Defroster Duck
1-9
Kick Pad Ventilator
. . . . . . . . . . . . . .
1-10
Upper Level Ventilation
. . . . . . . . . . . .
1- 10
Power Flow Ventilation System
. . . . . . . .
1- 12
2. Hold lever on top of heater case, Fig. 1-3 Tempest or
Fig. 1-4 Firebird, in full cold position (Full* left or
clockwise when viewed from above).
3. Adjust cable turnbuckle so that temperature control
lever will spring back 1
/
16" to 1 /8"-when pushed to
the OFF position.
AIR CONTROL CABLGADJUST
PONTIAC, TEMPEST AND FlREBlRD
1.
Place air control lever in OFF position.
2. Hold air door crank on heater case 'in a closed
position (Crank rotated full clockwise when viewed
from above).
3. While holding air control door in closed position,
1. Insure that cable is secured at control and at heater,
adjust turnbuckle to move lever against bottom of slot
and routed smoothly and free of sharp kinks or bends.
in control panel, then turn turnbuckle in opposite
direction to move control lever 1
/
16" to 1 /8" away
2. Place temperature lever to full cold position (full left
from end of slot.
on Pontiac and full down on Grand Prix) and hold in
this position.
4. Move lever to DE-ICE position, then back to OFF.
3. Adjust turnbuckle until cam roller bottoms at end of
heater cam slot (Fig. 1-1 Pontiac or Fig 1-2 Grand
Prix).
4. Move temperature lever to full heat position and
back again to full cold position. Lever should return to
end of slot and cam roller should be against end of
cam slot.
5. If cam roller is not at end of cam slot or if lever did
not go full travel, repeat repeat steps 3 and 4 until
cable is properly adjusted.
TEMPEST AND FlREBlRD
1. Make sure cable is secure at both ends.
5. Lever must have slight spring back from end of slot,
not to exceed 1 /8".
HEATER CONTROL PANEL
Pontiac, Tempest and Firebird heater controls are of
the horizontal slide lever design. The levers transmit
motion via three bowden cables to the air, defrost and
temperature doors.
Grand Prix models utilize vertical control levers. The
temperature lever actuates a cable and the select lever
a vacuum switch.
All heater control panels use a three speed blower
switch.