Check the flow of coolant through the radiator. A
1. Clean the cooling system with a good cooling system
clogged radiator will cause an inadequate supply of
cleaner and thoroughly flush to remove scale deposits.
coolant on the suction side of the pump. Clean the
Clean the exterior of the radiator core to open plugged
passages and permit normal air flow.
Remove the coolant filler cap and operate the engine,
checking for combustion gases in the cooling system.
Adjust fan belts to the proper tension to prevent
The cylinder head must be removed and inspected for
cracks and the head gaskets replaced if combustion
gases are entering the cooling system.
Check for an improper size radiator or inadequate
Check for an air leak on the suction side of the water
pump. Replace defective parts.
2. Check the coolant level and fill to the filler neck if the
coolant level is low.
3. The thermostat may not be closing. Remove,
inspect and test the thermostat.
Install a new
Inspect for collapsed or disintegrated hoses. Replace
thermostat, if necessary.
4. Excessive leakage of coolant past the thermostat
Thermostat may be inoperative. Remove, inspect and
seal is a cause of continued low coolant operating
test the thermostat; replace if found faulty.
temperature. When this occurs, replace the thermostat
Check the water pump for a loose or damaged impeller.