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