Cadillac 54-6219 1954 Shop Manual page 389

16-B-34
AUTOMATIC HEATING SYSTEM
Disconnect at ignition switch,
blower switches, and blower
motors, connect progressive
ly to locate short.
HEATER DIAGNOSIS CHART Cont'd
6.
EFFECT CAUSE REMEDY
3. Inadequate ice removal, a. Thermostatic valve control
unit poppet valve not opened.
b. Defective blower motor.
c. Defect in wiring.
d. See Trouble 2a.
e, See Trouble 1.
f.
See Note 4b,
Check lever adjustment.
Replace.
Repair.
4. Too warm in car,
a.
Cold air leaks strike capil-
lary tube.
b.
Capillary tube touching dash.
c.
Obstructioninairduct to de-
froster outlets,
d.
Temperature unit defective.
e.
Incorrect operation of con-
trols.
Repair leaks or close air vent.
Move tube away from dash.
Check for air flow through this
duct and repair if
obstructed.
Replace.
Instruct operator.
5. Cold Floor, a.
Air
leaks.
b. Hoses routed incorrectly.
Repair leaks or close summer
ventilator.Also see Trouble 1.
Connect as in Fig. lôa-1.
Blower fan will not run,
a.
Blown fuse.
b. Defective Motor.
c. Open circuit.
d.
Defective Switch.
Replace fuse.
Replace motor.
Repair circuit between ignition
switch, blower switch,
and
blower motor.
Replace Switch.
7. Underseat heater fan will
not run. 75 series only
a. Open circuit.
b. Defective Switch.
c.
Defective motor.
d.
Obstruction in fan blades.
Repair circuit between switch
and underseat heater motor.
Replace switch.
Replace motor.
Remove obstruction.
8. Control levers not aligned
up and down.
a. Incorrect adjustment. See Note 5.
9. Control knobs not aligned
in and out.
a. Improperly adjusted.
Adjust knobs.
10. Coolant Leaks. a. Hose leak at connections.
b.
Cores leak.
c. Temperature control
unit
leaks.
Replace or tighten clamps, re
place hose, repair or re
place nipple.
Repair if possible, otherwise
replace.
Replace.
11. Blown fuses. a.
Short in electrical system.