Buick LeSabre 1965 Service Manual page 809

1 1 - 7 6 OPTIONAL HEATER-AIR CONDITIONER SYSTEM
ACCESSORIES
c. Vacuum Switch Trouble Diagnosis—49000 Series
CONDITION
All controls off.
Air Conditioner Air Control
Lever on.
Air Conditioner Air Control
Lever on NORMAL and Air
Conditioner Temperature Con-
trol Lever on DEFROSTER and
HEATER TEMP levers OFF.
Air Conditioner Air Control
Lever on RECIRC.
Air Conditioner Air Control
lever RECIRC and DEFROST-
ER and/or HEATER TEMP
Control Levers on.
COMPLAINT
Air out of A/C outlets.
Air out of heater outlets.
Recirculated air only - no out-
side air, windows steam up,
air in car stale.
Air out of heater.
All air out of heater outlets.
Both recirculated and outside
air.
Air out of A/C and heater
outlets.
No recirculated air.
All air through heater outlets.
All air through A/C outlets.
POSSIBLE CAUSE
Check heater and evaporator
air door dual stage vacuum
diaphragm. No vacuum should
be present.
Check outside and recirculated
air door dual stage vacuum
diaphragm. No vacuum should
be present.
Check outside and recirculated
air door vacuum diaphragm.
Vacuum should be applied to
one or both stages depending
on position of lever.
Check that vacuum is applied
to both stages of heater and
evaporator air door vacuum
diaphragm.
No vacuum applied to both
stages of heater and evapora-
tor air door vacuum dia-
phragm. Heater and evaporator
air door stuck closed.
Vacuum applied to only one
stage of outside and recircu-
lated a i r door v a c u u m
diaphragm.
Check for defective heater
vacuum disc switch.
Defective air conditioner vac-
uum disc switch.
Check for defective vacuum
diaphragm.
Check for defective heater
vacuum disc switch.