Miscellaneous; On-Car Service Procedures; Available Heater Control Cable Adjustments - Pontiac TRANS AM 1977 Service Manual

HEATING AND VENTILATION
1A- 11
MISCELLANEOUS
CAUSE CORRECTION
Blown fuses caused by short in electrical Locate and correct short.
system.
Front floor mat wet under heater caused
Reseal windshield, or lead-in from
by improperly sealed windshield or radio antenna.
leaking heater core.
Repair (if possible) or replace
heater core.
Check for proper seal to dash and
for leak at hose connection on
heater core. Hose leaking into
the heater case is often misdiagnosed as
leaking core.
Check engine coolant level in
radiator.
Check for obstruction in core
and/or hoses.
Heater "gurgle" or whine.
ON-CAR SERVICE PROCEDURES
AVAILABLE HEATER CONTROL
CABLE ADJUSTMENTS
A & G SERIES AIR CONTROL CABLE
1. Place air control lever in OFF position.
2. Hold air door crank on heater case in "closed"
position.
2. Hold air door crank on heater case in "closed"
position. (crank rotated full counter-clockwise when viewed
from above.)
3. While holding air control door in closed position,
adjust turnbuckle to move lever against end of slot in control
panel. Then turn turnbuckle in opposite direction to move
control lever 1/16" to 1/8" away from end of slot if eased
out of detent.
4. Move lever to DEFROST position. Then back to
OFF.
5. Lever must have slight spring-back. If not quite
engaged in detent, must remain in detent when lever is moved
full travel.
A & G SERIES TEMPERATURE CABLE
1. Place temp lever at full COLD position (full left).
2. Rotate temp door crank to full COLD position (crank
rotated full clockwise as viewed from above).
3. Adjust turnbuckle until cable loop lines up with pin
on crank.
4. Move lever to full HOT. If door is not heard hitting
its seat, repeat the adjustment procedure.
B SERIES SHUT-OFF VALVE (PURGE
DOOR) CABLE
Rotate bell crank to pull valve (door) closed against
module case.
Adjust turnbuckle to enable
...
Installation of cable end to bell crank post and snap-in
flag.
F SERIES AIR CONTROL CABLE
1. Adjust mode cable by pulling to DEFROST position.
F SERIES TEMPERATURE CABLE
1. Adjust temperature cable by moving to MAX hot.
BOWDEN CABLE REPAIR
Repair cable or construct new cable of equal length using
parts from bowden cable service repair kit. Use cable housing
from original cable if possible. In most instances, only the
wire portion of the cable will require replacement.