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Unread 10-01-2014, 11:11 AM   #1
schnoomy5643
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2000 TJ Wrangler 
 
Join Date: Nov 2013
Location: Gambier, Ohio
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Bleeding green... Advice on cooling system repair

I've either got a bad water pump, seal, or thermostat housing seal. When I was leaving work, I noticed a large puddle under my Jeep that ran into other parking spots. After the 10 minute drive, I got out and noticed that something smelled warm so I popped the hood only to find that coolant was leaking slightly. I looked under the Jeep and saw the whole axle was covered, other suspension components, as well as the transmission. I saw it had accumulated at the bottom front part of the engine, but I wanted to find the source. I performed two tests.

Test 1: Start Jeep. At this point, I had gone to eat, so the temp was down to about 170. No leaks. When the temp gauge read ~200, I looked under again and it was raining coolant. I knew at this point that it was coming from the engine, not the radiator or a hose because it was running off of the front of the engine.

Test 2: After it cooled completely, I removed the radiator cap. This must've broken the vacuum in the system because it started to leak again. Not quite as bad, but a steady stream was coming off of the bottom of the engine block. A friend was able to put some pressure into the system by blowing into the radiator which caused more fluid to come out. Replacing the cap caused the leak to stop once again.

I don't have a garage, I also don't have really any time during daylight hours to work on the Jeep. School and work take up all of my daylight hours. I have about 3 hours saturday morning to work on it, and I'd like to get it fixed in that window if it's possible. I may try to tear it apart if I get time before that. Getting to the water pump doesn't seem too hard, but is there a possibility that it's just the seal for the W/P, or maybe even the seal to the thermostat housing? Is the only way to find out by tearing it apart? I didn't know if any of the symptoms pointed to anything specific. The second test I did makes me think it's just a seal, but I'm unsure. Any help here would be appreciated!!

It's a 4.0L also.


Last edited by schnoomy5643; 10-01-2014 at 01:13 PM..
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Unread 10-01-2014, 04:52 PM   #2
JWebber
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check all bolts first and see if one had backed off.
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Unread 10-01-2014, 05:48 PM   #3
oakmckinley
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If it's raining that bad are you sure it isn't a hose connected to the engine? A hose is a lot cheaper than a water pump.
Had you any overheating problems leading up to this point?

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Unread 10-01-2014, 07:33 PM   #4
Knuckelhead
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If the water pump seal has failed you will get coolant coming out of the weep hole in the housing under the shaft. Have you tried grabbing one of the fan blades to see if the water pump shaft is sloppy?...
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Unread 10-02-2014, 07:13 AM   #5
schnoomy5643
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Location: Gambier, Ohio
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I'll check the fan and the bolts tonight. I'll also check the hoses again. The only problem I've had with the cooling system in the 6 years I've owned it was a leaky radiator a few years back. It was slowly leaking at the top. The rest of it is stock. Well, the thermostat was replaced at that same time as well IIRC.
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Coolant leak , cooling system , water pump

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