Coolant podle, thermostat or pump? -
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Unread 08-16-2009, 07:55 PM   #1
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1994 ZJ 
Join Date: Mar 2005
Location: Jefferson,GA, Georgia
Posts: 646
Coolant podle, thermostat or pump?

I Okay so I replaced the upper hose this weekend, now I noticed that the zj is leaking after it's parked and reaches normal O Temperture. I tracked it down to near the pump but can not really tell whether it is comming from the thermostat housing or the top of the water pump. I can see coolant puddling near the housing. Could this be the top of the pump or the housing?? This picture is looking from top of engine down from where the upper hose inlet, behind the alternator. So not sure if it is comming from the back of the seal of the water pump of the thermostat housing.

1994 Hunter Green ZJ 5.2L Quadratrac
228k Miles, 2" BB.
2002 Slate Grey Grand Cherokee Overland
161k Bone Stock
2008 Black JK Sahara Unlimited (Love it!)

Last edited by porrsher; 08-16-2009 at 08:37 PM.. Reason: upload pics
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Unread 08-16-2009, 08:28 PM   #2
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2004 WJ 
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The water pump will have a weep hole in the bottom of it. If there is fluid coming out of that weep hole - the pump is on it's way out. If that weep hole is dry, it could be the thermostat.
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Unread 08-16-2009, 09:20 PM   #3
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also check the bypass hose
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Unread 08-17-2009, 03:47 AM   #4
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1998 ZJ 
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Double check the hose clamp. That type will loosen after a bit when first tightened. Hell, they loosen at anytime. I hate those clamps. I'm going to all T-Bolt clamps soon when I do the SC.
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Unread 08-17-2009, 05:49 AM   #5
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A pressure tester is ideal to check for leaks as it can be used on a cold engine. Pump it up and let it sit, you'll find the leak.
Sprinkle some talcum powder around the area as then you'll be able to see if it's coming from the stat housing or leaking from the hose.
Also, as stated above, that bypass hose has a tendency to be forgotten, so it deteriorates and leaks.
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