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Unread 10-21-2013, 08:16 PM   #1
bluedaffy
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1989 YJ Wrangler 
 
Join Date: Oct 2011
Location: Stevens Point, Wisconsin
Posts: 286
Coolant leak situation

Here's the deal. I put in a new water pump 2-3 weeks ago because the last one blew out and coolant was pouring from the weep hole. After I put the new pump in there was no leaking whatsoever, but then a couple of days ago it started to slowly leak again, but not nearly as bad as when the old pump blew out.

There has to be an explanation to this, because there seems to be a pattern.

The leak seems to vary in amount, it might just drip once every 10 seconds, or sometimes as much as one drip per second. There is a pattern however! When the jeep is just sitting in the garage cold, there is no drip. And from what I've noticed during the past couple of days, when the jeep is fully warm it does not drip. The times I've noticed it dripping where while the jeep is warming up, and while it's cooling down (after I shut it off).

I haven't been able to locate where it's coming from yet because I'm not quite sure how to go about it, I can't see the weep hole while everything is installed, but I have checked the hose connections and they seem to be fine...

Now maybe me noticing the leak at only the transition times are a coincidence, but so far that's the clue I'm hoping somebody can help me diagnose with.

Thanks

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Unread 10-21-2013, 08:42 PM   #2
bck4more
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1987 YJ Wrangler 
 
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Did you replace the hoese at the same time. Ive noticed before when taking off the hose that i ended up ruining it while trying to work on WP or thermostat
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Unread 10-21-2013, 09:19 PM   #3
bpounds
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There's not a lot to go on here, but I'll chime in anyway.

The reason it doesn't leak when it is cold, is because there is no pressure in the system when it is cold. So no surprise there. And it may not drip when hot, because it evaporates off before the drip forms.

I suggest you get yourself a cooling system pressure test kit. It allows you to pump up the pressure and check for leaks while the engine is cold and not leaking.

Then find the leak. Use a mirror if you have to, and get underneath and look up with a flashlight. Whatever it takes to see where it is leaking from.

Don't assume that a new pump shouldn't leak. Especially if it is a rebuilt. The quality of stuff we get these days just plain sucks.

Using the pressure test kit, you will know you are done when the system holds pressure for 20 minutes.
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Bill
Dodge did not build my Jeep.
1988 Wrangler,4.2L I-6, Howell EFI JP-1, 5 Speed Peugeot, Zone 2.5" lift + 1/2" booms, BFG 31 x 10.5, Bestop.
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Unread 10-22-2013, 06:38 AM   #4
Old4X
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Quote:
Originally Posted by bpounds View Post
There's not a lot to go on here, but I'll chime in anyway.

The reason it doesn't leak when it is cold, is because there is no pressure in the system when it is cold. So no surprise there. And it may not drip when hot, because it evaporates off before the drip forms.

I suggest you get yourself a cooling system pressure test kit. It allows you to pump up the pressure and check for leaks while the engine is cold and not leaking.

Then find the leak. Use a mirror if you have to, and get underneath and look up with a flashlight. Whatever it takes to see where it is leaking from.

Don't assume that a new pump shouldn't leak. Especially if it is a rebuilt. The quality of stuff we get these days just plain sucks.

Using the pressure test kit, you will know you are done when the system holds pressure for 20 minutes.

All good info.

I will ad that my hoses will ocasionally leak right after a WP change. Sometimes all that is needed is tightening the clamps up again.
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Unread 10-22-2013, 04:08 PM   #5
bluedaffy
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Thanks for the info. Hopefully tonight or tomorrow I will have time to do a thorough check to see if I can locate the source of the leak or to see if a hose is loose. I'll get a pressure tester if it comes to that, but man, I've never owned so many $50 gizmos for testing this, that, or the other thing in all my life before I owned a Jeep Those things really add up.
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Unread 10-22-2013, 06:02 PM   #6
bpounds
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Don't forget that you can rent a lot of stuff.

I think it is more a matter of the vehicle being 25 years old, than being a Jeep in particular.
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Bill
Dodge did not build my Jeep.
1988 Wrangler,4.2L I-6, Howell EFI JP-1, 5 Speed Peugeot, Zone 2.5" lift + 1/2" booms, BFG 31 x 10.5, Bestop.
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Unread 10-22-2013, 08:24 PM   #7
Old4X
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Quote:
Originally Posted by bluedaffy View Post
Thanks for the info. Hopefully tonight or tomorrow I will have time to do a thorough check to see if I can locate the source of the leak or to see if a hose is loose. I'll get a pressure tester if it comes to that, but man, I've never owned so many $50 gizmos for testing this, that, or the other thing in all my life before I owned a Jeep Those things really add up.
I have over $12,000 in tools, and looking to get more.

Don't forget, these vehicles sell for close to $40,000 new now, and when you work on your rig, you are paying those rates.
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Unread 10-23-2013, 09:55 AM   #8
pasinbuy
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1994 YJ Wrangler 
 
Join Date: Feb 2007
Location: florida
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I replaced my pump recently and had a problem with leaking. Come to find out the new pump was defective.

There is not a usa made water pump anymore so we have to cross our fingers with china crap...
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Unread 10-23-2013, 02:27 PM   #9
bluedaffy
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1989 YJ Wrangler 
 
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Location: Stevens Point, Wisconsin
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Quote:
Originally Posted by bpounds View Post
Don't forget that you can rent a lot of stuff.

I think it is more a matter of the vehicle being 25 years old, than being a Jeep in particular.
Yeah, my bad. You're right. I should be thankful that it runs as well as it does!
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