Labels:text | screenshot | document | font | menu | number OCR: Troubleshooting the Cooling System Problem Cause Solution High temperature gauge indication- . Coolant level low · Replenish coolant overheating Improper fan operation Repair or replace as necessary Radiator hose(s) collapsed · Replace hose(s) . Radiator airflow blocked · Remove restriction (bug screen, fog lamps, etc.) · Faulty pressure cap . Replace pressure cap Ignition timing incorrect . Adjust ignition timing · Air trapped in cooling system . Purge air . Heavy traffic driving · Operate at fast idle in neutral inter- mittently to cool engine Incorrect cooling system compo- + Install proper component(s) nent(s) installed . Faulty thermostat . Replace thermostat + Water pump shaft broken or · Replace water pump Impeller loose . Radiator tubes clogged · Flush radiator · Cooling system clogged · Flush system · Casting flash in cooling passages . Repair or replace as necessary. Flash may be visible by remov- ing cooling system components or removing core plugs. · Brakes dragging · Repair brakes · Excessive engine friction . Repair engine · Antifreeze concentration over 68% . Lower antifreeze concentration percentage · Missing air seals . Replace air seals · Faulty gauge or sending unit · Repair or replace faulty component . Loss of coolant flow caused by · Repair or replace leaking compo- leakage or foaming nent, replace coolant · Viscous fan drive failed · Replace unit Low temperature indication- + Thermostat stuck open . Replace thermostat undercooling · Faulty gauge or sending unit . Repair or replace faulty component Coolant loss-boilover . Overfilled cooling system . Reduce coolant level to proper specification . Quick shutdown after hard (hot) . Allow engine to run at fast idle run prior to shutdown · Air in system resulting in occa- . Purge system sional "burping" of coolant · Insufficient antifreeze allowing . Add antifreeze to raise boiling coolant boiling point to be too point low Antifreeze deteriorated because of . Replace coolant age of contamination . Leaks due to loose hose clamps. · Pressure test system to locate loose nuts, bolts, drain plugs. source of leak(s) then repair as faulty hoses. or defective necessary radiator
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