Jeep J-10 Series 1982 Technical & Service Manual page 1005

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FRESH AIR VENT
Fi|.30-3 Fred Air Intake
8«rvle« Diagnosis
COVER
PANEL
HEATER 30-3
Condition
Possible Cause
Correction
FAN MOTOR
WILL NOT RUN
AT ANY SPEED
(1) Blown fuse
(2) Loose connection
(3) Poor ground
(4) Faulty switch
(5) Faulty motor
(6) Faulty resistor
(1) Replace fuse
(2) Inspect and tighten
(3) Clean and tighten
(4) Replace switch
(5) Replace motor
(6) Replace resistor
FAN MOTOR RUNS
AT ONE SPEED ONLY
(1) Faulty switch
(2) Faulty resistor
(1) Replace 8witch
(2) Replace resistor
FAN RUNS BUT DOES
NOT CIRCULATE AIR
(1) Intake blocked
(2) Fan not secured to
motor shaft
(1) Clean intake
(2) Tighten securely
HEATER WILL NOT
HEAT
(1) Coolant does not reach
proper temperature
(2) Heater core blocked
internally
(3) Heater core air-bound
(4) Blend-air door not in
proper position
(1) Check and replace
thermostat if necessary
(2) Flush or replace core
if necessary
(3) Purge air from core
(4) Adjust cable
WILL NOT DEFROST
(1) Control cable adjustment
incorrect
(2) Defroster hose damaged
(1) Adjust control cable
(2) Replace defroster hose
80B87A