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Unknown radiator leak

 
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Old 29 Jun 2012, 05:08 pm
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Default Unknown radiator leak

Okay I need help. I have a 2001 cruiser with a mysterious leak. I have taken off the front wheel and engine cover. The leak is right above the main crank shaft. The water pump doesn't seem to be leaking. I can't see behind the crank. I need to know what I need to take apart to get a better view. The leak will stop when the radiator cap is put back on. Any ideas?
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Old 29 Jun 2012, 07:16 pm
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Default Re: Unknown radiator leak

Quote:
Originally Posted by drewt1047 View Post
Okay I need help. I have a 2001 cruiser with a mysterious leak. I have taken off the front wheel and engine cover. The leak is right above the main crank shaft. The water pump doesn't seem to be leaking. I can't see behind the crank. I need to know what I need to take apart to get a better view. The leak will stop when the radiator cap is put back on. Any ideas?
Then why take the cap off? Leave the cap on problem solved. Or is there more to this story?
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Old 29 Jun 2012, 08:19 pm
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Default Re: Unknown radiator leak

The coolant is low. When trying to refill the antifreeze it run right back out. As fast as you pour it in it comes right back out. The leak is coming somewhere above the center drive pulley. I notice that the water is going into the upper radiator hose and into the radiator and right on the ground. I have tried to get a good look at the source but can't locate it. I been underneath the car on top of the car with no good view of where the leak is. I don't know what is above the main pulley that can be leaking. Do anyone know what in that area? I might be time to take it to a shop. Too many things to remove just to get a good look.
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Old 29 Jun 2012, 08:48 pm
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Default Re: Unknown radiator leak

thermostat housing maybe?
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Old 30 Jun 2012, 12:46 am
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Default Re: Unknown radiator leak

The only thing in that area IS the water pump. Not sure how you determined it wasn't leaking. You can't see it due to the timing belt cover. To positively rule out the water pump, you'd have to remove all the crap on the left side of the engine. (it sucks doing it, btw)
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Old 30 Jun 2012, 02:21 am
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Default Re: Unknown radiator leak

I didn't think it was the water pump because the fluids comes out as soon as you put it in. As you're pouring into the radiator the fluid is hitting the ground. I will check the housing in the morning. Wouldn't the water pump start leaking slowly? I went from to problem to full blown leak. If the housing isn't leaking to the shop it goes. Anymore ideas would be appreciated.
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Old 30 Jun 2012, 04:14 am
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Default Re: Unknown radiator leak

Seals don't necessarily have to fail a certain way.

Since my engine is currently torn apart as I'm in process of redoing the head, timing belt, WP and stuff, I can tell you with without a doubt that the only thing that is above the crankshaft pulley that moves coolant through it is the water pump.

It certainly makes sense that if the water pump seal or housing failed the coolant would leak out exactly as you describe. Removing the cap allows air to come in to equalize the pressure. (like the vent on a gas can)

You should be able see the thermostat housing leaking when you are adding coolant.

Hope it's something easy!
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Last edited by JenneK; 30 Jun 2012 at 04:20 pm.
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Old 30 Jun 2012, 01:23 pm
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Default Re: Unknown radiator leak

I agree that it sounds like the water pump leaking. Although based on how you describe the size of the leak, I'm baffled at how putting the cap back on stops it from leaking. Maybe it stops leaking because it's already all leaked out before you get a chance to put it on?

But anyway, if it's leaking where you described, then it's gotta be the water pump.
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Old 30 Jun 2012, 10:47 pm
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Default Re: Unknown radiator leak

Thanks guys. I will have the water pump and other parts replaced next week. Where is the best place to get the parts? Is there a kit with all the parts you need?
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Old 30 Jun 2012, 11:26 pm
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Default Re: Unknown radiator leak

A lot of us on the forum get our pats from: RockAuto Auto Parts
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