Cadillac 60 Series 1963 Shop Manual page 444

13-63
AIR CONDITIONER DIAGNOSIS CHART
Condition
No air flow from Air Condi-
tioner outlets.
Insufficient air flow from Air
Conditioner outlets.
Air comes out heater instead
of Air Conditioner Outlets.
Air comes out some Air Con-
ditioner outlets but not others.
Air flow drops off at times.
Possible Cause
Shut off valves in air outlets
closed.
Inoperative on-off switch on
Heater-Air Conditioner control
panel.
Loose connector or open cir-
cuit in wiring.
Inoperative fan s w i t c h on
Heater-Air Conditioner control
panel.
Open circuit in blower motor.
Blown fuse.
Loose flexible h o s e feeding
right or left air outlet.
Loose air boot feeding center
outlet.
Loose connector at inlet end
of Heater-Air Conditioner as-
sembly.
Loose air duct between blower
and evaporator.
Poor seal between adapter in
right hand shroud side and
evaporator.
Obstruction in air hoses, ducts
or passageways.
Fan switch will not operate on
high speed.
Evaporator icing.
No vacuum supply to Air Con-
ditioner diverter valve vacuum
power unit.
Mechanical interference with
Air Conditioner diverter valve
or Heater-Air C o n d i t i o n e r
valve.
Shut-off valves in air outlets
closed.
Hose disconnected from outlet.
Evaporator core freezes.
Remedy
Instruct owner.
Replace switch.
Tighten connector or repair
circuit.
Replace switch.
Replace blower motor.
Replace fuse.
Attach hose securely.
Attach boot securely.
Tighten connector.
Tighten air duct.
Reposition seal to prevent air
leakage.
Remove obstruction.
Replace switch.
Adjust suction throttling valve.
Check vacuum c i r c u i t for
pinched, damaged, or discon-
nected hoses.
Check operation of vacuum
check valve and vacuum switch.
Replace if necessary.
Check air door operation. Re-
place vacuum power unit or
repair linkage at air door.
Remove interference.
Instruct owner.
Connect hose.
Adjust or r e p l a c e suction
throttling valve.