1 
Low coolant level.
Check for leaks and refill system !
 1 
Cooling system clogged.
Drain and flush or have radiator repaired !
 1 
Loose or broken fan belt.
Tighten or replace belt !
 1 
Thermostat stuck closed.
Check,replace thermostat !
 1 
Insufficient antifreeze.
Adjust antifreeze concentration !
 1 
Debris on radiator.
Hose off radiator !
 1 
Faulty water pump.
Have water pump replaced !
 1 
Collapsed water hose.
Locate and replace hose !
 1 
Leaking cylinder head gasket.
Have gasket replaced !
 1 
Late ignition timing.
Adjust timing to specifications !
 1 
Exhaust system blocked.
Replace damaged parts !
 1 
Oil or grease in coolant.
Flush system,have oil leak repaired !
 1 
Carburetor mixture too lean.
Adjust carburetor to specifications !
 1 
Pre-ignition or pinging.
Use higher octane gasoline !
 1 
Faulty or incorrect radiator cap.
Check,replace with proper cap !
 1 
Leak in radiator,hose or block.
Find and repair leak,refill system !
 2 
Faulty water pump.
Have water pump replaced !
 2 
Leaking cylinder head gasket.
Have gasket replaced !
 2 
Leak in radiator,hose or block.
Find and repair leak,refill system !
 3 
Thermostat stuck open.
Check,replace thermostat !
 3 
Thermostat missing.
Install proper thermostat !
 4 
Thermostat stuck open.
Check,replace thermostat !
 4 
Thermostat missing.
Install proper thermostat !
 4 
Clogged heater core.
Drain and flush or replace core !
 4 
Faulty heater control valve.
Have checked or replaced !
 5 
Debris on radiator.
Hose off radiator !
 5 
Low refrigerant charge.
Recharge system,check for leaks !
 5 
Loose or broken belt.
Tighten or replace compressor belt !