Posted by Steve@Advance on February 04, 2017 at 08:44:39 from (107.203.134.67):
In Reply to: waterpump blues posted by jasonteem on February 04, 2017 at 01:25:20:
It is a very rare occurrence for a water pump to stop pumping. It does happen, involves the impeller falling off, slipping on the shaft, rusting away... I've only seen one impeller fail in 50+ years of servicing vehicles.
If there is no circulation, you will find the engine gets hot, but the air through the radiator remains cold. That can be caused from a failed pump, but more likely to be:
A failed thermostat, blocking the circulation.
Airlock, some engines are designed that they can trap air. The coolant never reaches the thermostat or cavitates around the impeller. This usually happens following a drain and refill. Those will have bleeeder valves, usually around the upper plumbing, thermostat housing, pump housing, that you open and allow air to escape, then close when the bubbling stops. Sometimes a failed thermostat will cause airlock. If the thermostat doesn't open, steam will build and push the coolant down below the pump and back out the radiator.
A blocked radiator. This happens, but it is a progressive failure, happens over time. Usually will show as being able to feel cold spots on the core where there is no circulation. More common on older equipment that has not been properly maintained.
But, you say the coolant is just sitting there, can't tell if it's moving. As long as the engine is not overheating, and there is "some" heat coming through the radiator, it probably is OK. If you are trying to get circulation, and the weather is cold, the thermostat will only allow a small amount of coolant to circulate, especially on an idling engine. Might keep an eye on the temperature and the coolant level, put some load on the engine, work it, then carefully check the coolant to be sure it is full.
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