Chrysler DODGE D150 1993 Service Manual page 1441

24 - 4 HEATING AND AIR CONDITIONING
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(1) Possible location or cause of blower motor vi­
bration are as follows:
(a) Blower motor assembly loose in heater A/C
housing.
(b) Blower wheel loose on motor shaft.
(c) Blower wheel out of balance or bent.
(d) Blower motor defective.
(2) Possible location or cause of blower motor noise
are as follows: (To verify blower noise disconnect
blower motor wire lead connector and operate h e a t e r
or A/C system. If noise goes away, proceed with pro­
cedure.)
(a) Refer to vibration section of this procedure.
(b) Foreign material in Heater-A/C housing
around blower wheel.
(c) Blower wheel rubbing Heater-A/C housing.
(d) Blower motor defective.
HEATER DIAGNOSIS (MECHANICAL)
INSUFFICIENT HEAT
OBSTRUCTED HEATER OUTLETS
TEMPERATURE DOOR MISDIRECTED
OR BINDING, KINKED OR UNATTACHED
CONTROL CABLE (SEE CONTROL CABLE
SECTION).
MODE DOOR IMPROPERLY ADJUSTED OR
BINDING. UNATTACHED CONTROL CABLE.
±
OBSTRUCTED HEATER HOSE
•
KINKED HEATER HOSE, SEE ROUTING.
±
AIR IN HEATER CORE
LOW COOLANT FLOW, INSUFFICIENT
COOLANT IN SYSTEM. DEFECTIVE
THERMOSTAT. WATER PUMP BELT LOOSE.
GREATER THAN 50% MIXTURE
OF ANTIFREEZE. ENGINE TEMPERATURE
LOW SEE GROUP 7. ENGINE COOLING
DIAGNOSIS.
•
OBSTRUCTED INTAKE IN MANIFOLD
PASSAGE.
1_
HEATER CORE PLUGGED.
WATER VALVE PARTIALLY OR
FULLY CLOSED.
TOO M U C H HEAT
IMPROPERLY ADJUSTED TEMPERATURE
CONTROL CABLE.
DISCONNECTED OR BROKEN, KINKED
TEMPERATURE CABLE.
BLEND-AIR (TEMP) DOOR
BINDING OR MISDIRECTED
ENGINE THERMOSTAT DEFECTIVE.
J9124-115