Irrespective of how careful you are with your maintenance, the radiator water pump will eventually fail. Signs include;
- TEMPERATURE FLUCTUATIONS
When the cooling system is operating correctly, the temperature should be stable throughout a range of operating conditions. But, if your temperature gauge starts fluctuating between normal and hot, this may indicate a bad water pump. Because this symptom can also be caused by a faulty radiator, thorough investigation should be performed.
Coolant drops under the part of the vehicle the water pump housing. This could indicate a bad water pump. If coolant drops are found, an under-hood inspection should be carried out. When cool, check around and under the engine for indications of coolant leaks. However know that if the leak is minor, the drops will have dried up, giving a distinctive trail.
- GRINDING SOUNDS OR GROANING NOISE
When the water seal has been worn, coolant leaks drop into the bearing and wash out its grease. Without the grease, the bearing will be overheated and cause a groaning or grinding sound from the water pump. This noise is loud enough to be heard from the outside of the engine compartment, and will get louder as engine increases in speed. If this is allowed, the bearing can actually break apart causing the pulley to fall off the pump. When this happens during driving, there will be a loss of engine derived power duties, because the belt will have pulled off.
SEE ALSO:WHAT IS A WATER PUMP GASKET