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7 - 4
COOLING
COOLING (Continued)
CONDITION
INADEQUATE HEATER
PERFORMANCE. GUAGE MAY OR
MAY NOT READ LOW.
HEAT ODOR
POSSIBLE CAUSES
2. Thermal viscous fan drive not
working.
3. Air seals around radiator
damaged or missing.
1. Heavy duty cooling system, and
cooler ambient temperatures.
2. Obstruction in heater hoses.
3. Water pump damaged.
1. Damaged or missing drive line
heat shields.
2. Thermal viscous fan drive
damaged.
CORRECTION
2. Check fan drive. (Refer to 7 -
COOLING/ENGINE/FAN DRIVE
VISCOUS CLUTCH - DIAGNOSIS
AND TESTING)
3. Inspect air seals, repair or
replace as necessary.
1. None. Normal condition.
2. Remove hoses, remove
obstruction.
3. Replace water pump.
1. Repair or replace damaged or
missing heat shields.
2. Check thermal viscous fan drive.
(Refer to 7 - COOLING/ENGINE/
FAN DRIVE VISCOUS CLUTCH -
DIAGNOSIS AND TESTING)
VA
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