88807A28 Mercury CABLE

Recommended Repairs
Plugged Cooling Fins for the Radiator
Clean obstructions in cooling fins for the radiator.Problems With the Cooling Fan
Check for proper operation of the cooling fan. Check applicable drive belts, pumps, speed sensors, and/or solenoids for proper operation.Reduced airflow through the radiator can be caused by one of the following items:
Incorrect fan
Improperly positioned fan shroud
Damaged fan bladeThe fan must be large enough to send air through most of the area of the radiator core.Loose fan drive belts or loose water pump belts will cause a reduction in air and coolant flow. Tighten the belts to the proper tension. Refer to Specifications, "Belt Tension Chart".Extreme Operating Conditions
Determine if the engine is operating under extreme outside temperatures or high altitudes.When outside temperatures are too high for the rating of the cooling system, there is not enough temperature difference between the outside air and coolant temperature in order to properly cool the engine.The cooling capacity of the cooling system goes down as the engine is operated at higher altitudes. A pressure type cooling system with the proper coolant mixture must be large enough to keep the coolant from boiling.Running an engine at lower engine speeds can cause the engine to lug. This low rpm causes a reduction in air flow through the radiator. The low rpm also causes a reduction in the flow of coolant through the system. This combination of less air flow and less coolant flow during high input of fuel can cause the engine to operate at a higher temperature.Faulty Thermostatically Controlled Shutter
Check the operation of the shutters. The shutters should be completely closed at the temperature below the fully open temperature of the water temperature regulator.Water Temperature Regulator
A water temperature regulator that does not open completely can cause above normal operating temperatures. A water temperature regulator that does not open at the proper temperature can cause above normal operating temperatures. To test the water temperature regulator, refer to Systems Operation, Testing And Adjusting.Radiator Cap
A pressure drop in the radiator can cause the boiling point to lower. The lower boiling point could allow the engine to overheat. A pressure test of the radiator cap rating may be used to check the relief pressure of the cooling system. Ensure that the gasket sealing surface is clean and undamaged. If the cap fails the test, check the rubber seal on the radiator cap. If the radiator cap seal is ok, then replace the radiator cap.Radiator
Clean the radiator core fins and flush the radiator. Check the radiator core for proper coolant flow. Replace the radiator or repair the radiator if the coolant flow is low through the radiator core.A radiator that is undersized for an application will not effectively transfer the heat from the engine. A radiator that is undersized will cause the engine to run at a temperature that is higher than normal. Make sure that the radiator is sized in accordance with the OEM specifications.Faulty Water Pump
A water pump that has a loose impeller, an eroded impeller, or a damaged impeller does not pump enough coolant for correct engine cooling. Remove the water pump and check for damage to the impeller. If the impeller has no damage, check the impeller clearance.Low Coolant Level
If the coolant level is too low, not enough coolant will circulate through the engine and the radiator. The decreased flow of coolant will not remove enough heat from the engine. This will cause the engine temperature to rise. Low coolant level is caused by the one or more of the following items:
Leaks
Faulty radiator cap
Boiling of the coolant
Incorrect filling of the radiatorCheck the level of the engine coolant when the engine is cool. Ensure that the coolant can be seen at the low end of the filler neck on the top tank of the radiator.Incorrect Coolant Mixture
Check the mixture of antifreeze and water. The mixture should be approximately 50 percent water and 50 percent antifreeze with a 3 to 6 percent coolant conditioner. If the mixture is incorrect, drain the cooling system, as needed. Put the correct mixture of water, antifreeze and coolant conditioner in the cooling system.Air in the Cooling System
Air can enter the cooling system in different ways. The most common ways are improper filling of the cooling system and combustion gas leakage into the cooling system. Combustion gas can get into the cooling system through internal cracks, a leaking gasket or the seal from the fuel nozzle adapter, a faulty cylinder head, or a faulty head gasket. Air in the cooling system causes a reduction in coolant flow and bubbles in the coolant. Air bubbles insulate the coolant from the engine parts. This prevents the transfer of heat to the coolant.Combustion gases can pressurize the cooling system. This can cause coolant leakage past the radiator cap. The combustion gases can also increase the temperature of the engine by adding heat from combustion to the cooling system.Faulty Temperature Gauge
A temperature gauge which does not work correctly will not show the correct temperature. Verify the accuracy of the temperature gauge if the temperature gauge indicates that the coolant temperature is too high but other conditions are normal. Use a temperature gauge of known accuracy, or check the cooling system with the 4C-6500 Digital Thermometer .Faulty Sending Unit
Some cooling systems use a temperature sensor in the engine that sends signals to a sending unit. The sending unit converts these signals to an electrical impulse which is used by a mounted gauge. If the sending unit malfunctions or the wiring has an open or a short, the gauge can show an incorrect reading.Worn Hoses or Damaged Hoses
Faulty hoses with leaks can normally be seen. Hoses that have no visual leaks can collapse during operation. This will cause a restriction in the flow of coolant. Hoses become soft and/or get cracks after a period of time. Hoses should be replaced after 3000 hours or two years of use. The inside of a hose can deteriorate, and the loose particles of the hose can cause a restriction of the coolant flow.Air