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Unread 03-04-2013, 10:57 AM   #1
1996ZJI-6
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Engine coolant

My engine coolant jug is empty and filled it up to the add last night. Empty now. I am using the heat in the car. But why is it using up all the fluid? And no leaks right now. It did leak a little bit in January and December.

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Unread 03-04-2013, 11:13 AM   #2
SAR-Swimmer
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My guess is that your cooling system fluid was low, and when you filled the jug, it went to top off the system.
Make sure you fill the system, burp it well, then fill your over-flow jug.
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Unread 03-04-2013, 11:16 AM   #3
1996ZJI-6
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Okay cause I just refilled it just a minute ago because it was low. I think your right if its sucking it down. I probably have a leak somewhere but sense it's so low I don't know it yet. Thanks
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Unread 03-04-2013, 01:38 PM   #4
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Since the cooling system is a closed system it shouldn't be using any coolant, or little need to add more, unless you just changed the coolant out and had air in the system.

Does it smell like antifreeze when you have the heater/defrost on? If so the heater core could be leaking with the coolant is flowing out of the HVAC box drain line into the frame. It would empty out on the bottom of the passenger side lower frame at the same place where the water from the AC evaporator drains. Sometimes the coolant will leak out on the passenger floor but would think you would notice the smell as soon as opening the door.

Would also check the oil and trans fluid for milky looking antifreeze if you can't find any leaks anywhere. But could just be a cracked overflow reservoir on the bottom and look closely up under the front to make sure it isn't the water pump weep hole or a radiator hose. Good luck.
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Unread 03-04-2013, 04:14 PM   #5
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A ZJ that age can have coolant leaks from a variety of places, the rad, water pump and heater core. If you've used the newer coolant that Chrysler specifies for their newer cars, it does not smell as much, to the point where you may not notice a smell but if the windows fog up with the heat on, you can be pretty sure it is a heater core leak. I also noticed a small amount of coolant coming out of one of the rear heater ducts when mine went bad.
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Unread 03-06-2013, 10:13 AM   #6
1996ZJI-6
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Well it's leaking now!
image-970983457.jpg  
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Unread 03-06-2013, 10:46 AM   #7
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Mine had a crack in the radiator and when I would turn it off after driving or it was idling the coolant would spew out of the crack. It took a lot of looking to find it. Get under there and track where the coolant is coming from.
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Unread 03-06-2013, 10:59 AM   #8
1996ZJI-6
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To me it seems it coming from the hoses linking to it and the passenger corner too.
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Unread 03-06-2013, 12:59 PM   #9
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Do you see any leaks further up the rad instead of just the bottom? On my rads the leaks seemed to be towards the top and you may have to take the metal brace off of the top which holds the rad in to check for leaks. Unfortunately on the 96 4.0 you can't remove the fan shroud w/o first removing the fan. Believe I'd check all the hoses for holes/clamp tightness before doing this. Also check the draincock on the passenger side which is accessed by removing the front grill.
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-Crankshaft position sensor multimeter test. & video of testing.
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Unread 03-06-2013, 01:11 PM   #10
1996ZJI-6
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I believe it's on the bottom
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Unread 03-06-2013, 01:45 PM   #11
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Well you're probably going having to slide under the front to see where it's coming from as Polka already mentioned. May be best to hose/blow off the antifreeze, fill the rad up some, then look w/a flashlight for leaks after it's been running for a few minutes.
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-Stalling ZJ? 12 things to check before replacing a sensor; the Dirty Dozen
-Crankshaft position sensor multimeter test. & video of testing.
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Unread 03-06-2013, 02:08 PM   #12
Camaro16
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My rad leaked like that for about a month, I'd just top it off every few days (short drive to work and back, 7 miles).
Then one day it went bang-hiss - massive crack in the side tank, all coolant gone. Had to get a tow as the water would piss out as fast as I could put it in from a 25l can. New one was a real pain to put in because of mismatching tranny cooler fittings, but since I sorted them out using hydraulic hose (rated for temp and pressure) instead of hard lines, it's been fine.
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Unread 03-06-2013, 02:44 PM   #13
1ATony
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Quote:
Originally Posted by 1996ZJI-6 View Post
I believe it's on the bottom
I know how you feel trust me. I just did 2 water pumps, two radiators, two thermostats, two sets of all new hoses...lol

Yes both my 150,000 WJ and 122,000 ZJ decided to caugh up radiators within 7 days of each other....lol

If you have some miles on that baby, you may want to replace all of this stuff while you're in there. I tossed new serpentine belts on both Jeeps too.

They both run a good 15 degrees cooler than they did with the old parts.

Here's a link to the raditor if it has the 4.0. We carry new water pumps too. If you need help with anything shoot me a PM or buzz me in the office. We have free shipping on everything.

96 4.0 Jeep Grand Cherokee Radiator

96 4.0 Jeep Grand Cherokee Water Pump with Tube
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Unread 03-06-2013, 03:38 PM   #14
1996ZJI-6
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Okay. Ill you know. Thanks. But it only leaks when included when parked at the house, and when it's filled up to add on the engine coolant jug
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Unread 03-06-2013, 05:51 PM   #15
PolkaPower
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Quote:
Originally Posted by 1996ZJI-6 View Post
Okay. Ill you know. Thanks. But it only leaks when included when parked at the house, and when it's filled up to add on the engine coolant jug
Mine would only leak after driving a bit it and then parking it or sitting in idle. I would come home and turn it off then watch as the coolant leaked out. While I was driving around it was fine. If I stopped at a light I would start to smell coolant. It wasn't a big leak just enough to annoy. I found it after I took the metal radiator guard off under the hood on the top. There was a 3-4" crack on the top right leaking down all over the place.
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