CONDITION
POSSIBLE CAUSE
CORRECTION
14. Dragging Brakes.
14. Inspect brake system and repair
as necessary. (Refer to 5 -
BRAKES/HYDRAULIC/
MECHANICAL - DIAGNOSIS AND
TESTING)
15. Bug screen or other aftermarket
accessory is being used causing
reduced air flow.
15. Remove bug screen or
accessory.
16. Thermostat partially or
completely closed.
16. Check thermostat operation and
replace as necessary. (Refer to 7 -
COOLING/ENGINE/ENGINE
COOLANT THERMOSTAT -
DIAGNOSIS AND TESTING)
17. Electric radiator fan not
operating properly.
17. Check electric fan operation and
repair as necessary.
18. Cylinder head gasket leaking.
18. Check cylinder head gasket for
leaks. (Refer to 9 - ENGINE/
CYLINDER HEAD - DIAGNOSIS
AND TESTING)
19. Heater core leaking.
19. Check heater core for leaks.
Repair as necessary.
TEMPERATURE GAUGE READING
IS INCONSISTENT (FLUCTUATES,
CYCLES OR IS ERRATIC)
1. The gauge may cycle up and
down. This is due to the cycling of
the electric radiator fan and/or
changing vehicle operating
conditions.
1. A normal condition. No correction
is necessary. If gauge cycling is
going into the hot zone, check
electric fan operation and repair as
necessary. (Refer to 7 - COOLING/
ENGINE/RADIATOR FAN -
DIAGNOSIS AND TESTING)
2. During cold weather operation
with the heater blower in the high
position, the gauge reading may
drop slightly.
2. A normal condition. No correction
is necessary.
3. Temperature gauge or engine
coolant temperature sensor is
defective or shorted.
3. Check operation of gauge and
repair as necessary. (Refer to the
Appropriate Diagnostic Information)
4. Gauge reading rises when
vehicle is brought to a stop after
heavy use (engine still running).
4. A normal condition. No correction
is necessary. The gauge should
return to normal range after vehicle
is driven.
5. Gauge reading high after
restarting a warmed-up (hot)
engine.
5. A normal condition. No correction
is necessary. The gauge should
return to normal range after a few
minutes of engine operation.
6. Coolant level low (air will build
up in the cooling system causing
the thermostat to open late).
6. Check cooling system for leaks.
Repair as necessary. (Refer to 7 -
COOLING - DIAGNOSIS AND
TESTING)
JR
ENGINE
7 - 17
ENGINE (Continued)