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Old 11-04-2009, 03:48 PM   #1 (permalink)
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Default Indicators for bad water pump?

Hi all,

For the past couple of nights after I get home and out of the car I smell a little coolant.

So last night I looked down under the car and there is indeed coolant on the ground, but only a bit. I checked the hoses and they were fine.

Now I've heard that with a bad water pump it could start leaking, is this true? and does it only leak when the car is running?

Keep in mind, it is a slow leak and after I park the car it stops leaking. And the car isn't overheating.

Thanks for all help!
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Old 11-04-2009, 06:46 PM   #2 (permalink)
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Many water pumps have a weap hole, so that when the pump fails, it will begin to slowly leak coolant. I can't verify if the Subaru water pumps are this way, but I know my GMC Sierra was, and so are both of my motorcycles.
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Old 11-04-2009, 07:34 PM   #3 (permalink)
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Others who have actually changed a water pump might know if there is a specific weep hole on the lower side, but this pictorial for the 2005-9 series doesn't show one. Coolant that gets past the seal (3) and through the bearing (2) would come out from under the pulley (1).

Coolant leaks can be almost anywhere there are joints or seals where coolant flows. Assuming the water pump is the source might be premature, and costly.

It's probably best to examine the underside of the engine to try to trace exactly where the coolant is coming from. This might require removing the plastic under-engine cover, if the car has one. Coolant will often leave a damp trail which can make finding the source easier. Sometimes cleaning the engine will also aid in finding the leak. And yes, whatever it is, it could leak when the engine is hot and the cooling system is under pressure, but not when it cools down.
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Old 11-04-2009, 09:52 PM   #4 (permalink)
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If it's the water pump leaking you'll see the coolant running along the bottom of the timing belt covers and dripping down. That's what mine did anyways.
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Old 11-04-2009, 10:37 PM   #5 (permalink)
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my 98 had a bad waterpump, it has the weephole, but it didnt start showing coolant anywhere for a couple of months.

you should keep in mind that when you change the WP, you might as well do the timing belt and anything associated with that part of the engine while your there.
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Old 11-05-2009, 06:26 AM   #6 (permalink)
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Quote:
Originally posted by d0sitmatr
my 98 had a bad waterpump, it has the weephole, but it didnt start showing coolant anywhere for a couple of months.

you should keep in mind that when you change the WP, you might as well do the timing belt and anything associated with that part of the engine while your there.
Good point, I did those as well.
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