If it is making a noise or leaking then it is defective. The only real fix is to replace it. You can rebuild one, but it is not advisable.
It is rare for a water pump not to work however a water pump going bad will leak coolant and can be noisy from bad bearings.
Only replace the water pump if you have a visible external leak, the water pump bearings are bad, or the shaft is broken.
Normal wear on the bearings inside.
Either the pump bearings are bad or the ac clutch is going bad. The clutch can be replaced but the pump bearings are not generally cost effective to change.
where is the leak?
The weep hole is "an indicator of bad bearings and/or seals" in the water pump when antifreeze starts to drip or run out of it. If antifreeze is coming out the weep hole, change the water pump.
yes and no. depends on what you mean by "bad" the bearings can go out in it but it will still move water keeping engine cool but making a heck of a racket.
the timing belt can cause a water pump to go bad if the belt is on too tight, because that will put stress on the bearings making it wear out rather quickly.
grab both hands on each side of the fan blades while it is still installed on the water pump and try to shake it or wiggle it. if it wiggles or fells loose while both hands are trying to wiggle it then the bearings are bad and if not then the pump is good
Might just be the bearings in the front wheels. Check that. Also, a smart thing to check will be the water pump, if the pump is bad, makes it sound like the front main bearings in the engine are bad. And, hopefully there is nothing wrong with the engine. Good luck.
It is possible that the bearings are going bad on the water pump but you are going to have to listen to where the noise is coming from, whether it is inside the engine ( rod knock or oil pressure issues ) or outside (pump bearings or pulley issues).I lean toward internal wear or damage to the engine since the noise goes away when it warms up which indicates that when good oil circulation is present the problem goes away, bad bearings in a water pump will always make noise until they are repaired.
A good sign of a water pump going bad is noise. It usually makes a grinding sound. Another sign is antifreeze leakage around the water pump. Some manufacturers put a small hole on the top side of the pump so that when the bearings fail coolant leaks out from this hole. Another good sign is high water temp gauge. When the water pump goes bad it fails to do its job of pumping coolant through the engine, hence the high water temp gauge. Hope this helps.