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Unread 09-04-2014, 09:57 AM   #1
iamjpad
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2002 KJ Liberty 
 
Join Date: Aug 2014
Location: Fairfax, VA
Posts: 16
Help find Leak on 02 Liberty 3.7

I have noticed that there is a leak under my 02 Liberty 3.7 and the thing driving me crazy is I can't seem to find out what is actually leaking.
All I know is I come out, and I see a puddle of some liquid underneath the front of the car. Funny thing is the leak is not instant.

Yesterday for instance car was driven around for a bit. Parked and left it. No leak for hours. But I know something eventually will leak, so I place a cardboard underneath the car, sure enough, come out in the morning and there is what looks like a mix of water and maybe grease or oil under the car.

It's not the radiator which I suspected, as the drip was much further inside towards the center. There is a metal cover plate and I think the leak collects under it and then drips out the hole of the coverplate.

One suspicion is that it's just water from the AC dripping onto the coverplate and mixing with grease on the plate already, I noticed the coverplate when taken off is coated in what I can only refer to as caked on grease.

I was going to do a coolant pressure test to see, but I'm pretty sure it is not the radiator as the drip is way to far inside to be from it.

Anyone got any ideas to "STOP THE INSANITY"

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Unread 09-04-2014, 04:23 PM   #2
iamjpad
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Join Date: Aug 2014
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Update

This car is the gift that just keeps on giving...

So I grabbed a pressure test tool from my local parts shop.
Placed a cardboard under the car and clamped on tool and I get it to 18PSI.
YUP.. I start getting a drip. I'd say 1 drop a minute which is plenty IMHO.
Pressure dropped to 16PSI within 5mins and down to 13PSI in 30mins.

I tried to pin point where the leak was coming from and no luck. I couldn't get the stupid solid steel protective plate underneath the car to come off. arghhhh!!

Now I need help with what leak might be.
What I know is that it isn't radiator for sure. It's coming from under the engine, but it could just be run off to the base.

It is on the passenger side (left, if facing engine). Since I couldn't get out the plate I couldn't get a good look from underneath. From the top I couldn't see the leak point. Frustrating
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Unread 09-04-2014, 08:49 PM   #3
02blue
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2002 KJ Liberty 
 
Join Date: Aug 2011
Location: Frederick, MD
Posts: 599
Check the hose coming out of the bottom of the reservoir and the heater hoses are right there too.
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Unread 09-08-2014, 06:25 AM   #4
iamjpad
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From what I can see, it appears to be coming from the location of the thermostat and under the engine. A little drip drip drip when at pressure. This car is just out to take take take $$$
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Unread 09-08-2014, 07:23 AM   #5
tommudd
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Could be a bad hose, thermostat housing or water pump all more or less in the same area there
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Unread 09-08-2014, 11:43 AM   #6
iamjpad
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I thought it was the housing too. Isn't the waterpump located at the from of the engine driven by the drive belt, or am I missing something?
From what I could tell, the thermostat housing is at the rear of the engine which is where the leak is coming out.
Question is when the thermostat housing is replaced, does one also change the thermostat, mine appears to be working fine.
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Unread 09-08-2014, 12:44 PM   #7
tommudd
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Quote:
Originally Posted by iamjpad View Post
I thought it was the housing too. Isn't the waterpump located at the from of the engine driven by the drive belt, or am I missing something?
From what I could tell, the thermostat housing is at the rear of the engine which is where the leak is coming out.
Question is when the thermostat housing is replaced, does one also change the thermostat, mine appears to be working fine.
Thermostat housing is at the front of the engine, right front, right under the fill tube for the oil almost . Look at the lower rad. hose and follow it
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Unread 09-11-2014, 06:10 PM   #8
iamjpad
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Quote:
Originally Posted by tommudd View Post
Thermostat housing is at the front of the engine, right front, right under the fill tube for the oil almost . Look at the lower rad. hose and follow it
You are right it's all in front, I had slid in upside down under the car. Dohh..
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Unread 09-14-2014, 07:50 AM   #9
Tombo_ontario
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2002 KJ Liberty 
 
Join Date: May 2014
Location: Windsor, Ontario
Posts: 49
I got a leak too from thermostat housing....temperatures around here just dropped so woke up this morning to find a fairly large puddle of coolant under the jeep. It had dripped from the thermostat housing at the front of the engine onto the skid plate, and ran back to the rear part of the skid plate then dropped to the ground...might be mistaken for a leak I somewhere else if you don't take the time to actually locate the direct source of the leak...

Anyways...beats having a leak from the water pump...
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Unread 02-07-2015, 10:49 AM   #10
iamjpad
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2002 KJ Liberty 
 
Join Date: Aug 2014
Location: Fairfax, VA
Posts: 16
Updates
It turned out it was the waterpump.
I bought my own parts and had the thermostat, waterpump etc replaced.
No Leaks for 3 months
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