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Table 10: Overheating troubleshooting
Problem
Symptoms
Possible Causes
Solutions
Overheating
Exceed
coolant
temperature
limit
Air flow direction
Correct air flow
direction
Fan rotation
Correct fan rotation
Restriction of air
flow
Reduce restriction of
air flow
Recirculation of air
flow
Reduce recirculation
of air flow
Prevailing winds
Relocate radiator
Loose belts
Correct belt tension
Low coolant flow
Check for pump
cavitation
Piping restrictions
Check for correct
venting & makeup
piping
Vent all high points
in the piping
Low coolant level
Refill to proper level
Outside of radiator
dirty or plugged
Clean radiator
Bent or loose
radiator fins
Straighten fins
Coolant thermostat
or temperature
switch malfunction
Repair or replace
thermostat or
temperature switch
Contaminated
coolant
Test coolant
Coolant mixture of
antifreeze & water
is not correct
Test coolant