Dodge 2001 Ram 1500 Owner's Manual page 346

BR/BE
COOLING (Continued)
CONDITION
NOISY VISCOUS
FAN/DRIVE
INADEQUATE HEATER
PERFORMANCE.
THERMOSTAT FAILED
IN OPEN POSITION
STEAM IS COMING
FROM THE FRONT OF
VEHICLE NEAR THE
GRILL AREA WHEN
WEATHER IS WET,
ENGINE IS WARMED
UP AND RUNNING,
AND VEHICLE IS
STATIONARY.
TEMPERATURE
GAUGE IS IN NORMAL
RANGE
POSSIBLE CAUSES
1. Fan blades loose.
2. Fan blades striking a surrounding
object.
3. Air obstructions at radiator or air
conditioning condenser.
4. Thermal viscous fan drive has
defective bearing.
5. A certain amount of fan noise may be
evident on models equipped with a
thermal viscous fan drive. Some of this
noise is normal.
1. Has a Diagnostic trouble Code (DTC)
been set?
2. Coolant level low
3. Obstructions in heater hose/fittings
4. Heater hose kinked
5. Water pump is not pumping water
to/through the heater core. When the
engine is fully warmed up, both heater
hoses should be hot to the touch. If only
one of the hoses is hot, the water pump
may not be operating correctly or the
heater core may be plugged. Accessory
drive belt may be slipping causing poor
water pump operation.
1. During wet weather, moisture (snow,
ice or rain condensation) on the radiator
will evaporate when the thermostat
opens. This opening allows heated water
into the radiator. When the moisture
contacts the hot radiator, steam may be
emitted. This usually occurs in cold
weather with no fan or airflow to blow it
away.
COOLING
CORRECTION
1. Replace fan blade assembly. (Refer to
7 - COOLING/ENGINE/RADIATOR FAN -
REMOVAL)
2. Locate point of fan blade contact and
repair as necessary.
3. Remove obstructions and/or clean
debris or insects from radiator or A/C
condenser.
4. Replace fan drive. Bearing is not
serviceable. (Refer to 7 - COOLING/
ENGINE/FAN DRIVE VISCOUS CLUTCH
- REMOVAL).
5. (Refer to 7 - COOLING/ENGINE/FAN
DRIVE VISCOUS CLUTCH -
DESCRIPTION) for an explanation of
normal fan noise.
1. (Refer to 25 - EMISSIONS CONTROL -
DESCRIPTION) for correct procedures
and replace thermostat if necessary
2. (Refer to 7 - COOLING - DIAGNOSIS
AND TESTING).
3. Remove heater hoses at both ends and
check for obstructions
4. Locate kinked area and repair as
necessary
5. (Refer to 7 - COOLING/ENGINE/
WATER PUMP - REMOVAL). If a slipping
belt is detected, (Refer to 7 - COOLING/
ACCESSORY DRIVE/DRIVE BELTS -
DIAGNOSIS AND TESTING). If heater
core obstruction is detected, (Refer to 24
- HEATING & AIR CONDITIONING/
PLUMBING/HEATER CORE -
REMOVAL).
1. Occasional steam emitting from this
area is normal. No repair is necessary.
7 - 11