04 WJ 4.7l Coolant Draining. No visible leak? - JeepForum.com
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post #1 of 5 Old 09-20-2017, 06:13 PM Thread Starter
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2004 WJ 
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Angry 04 WJ 4.7l Coolant Draining. No visible leak?

Hi guys,

Wondering if anyone had any ideas about my coolant level dropping fairly quickly from my overflow reservoir. Empty the other day, filled it up, lost about half an inch, filled it up, lost about an inch today. Can't find a leak anywhere but you can smell the coolant in the engine bay. Changed the water pump a few months ago and that's fine, no leaks there. Seems to smell more at the front of the engine like it is the radiator or something? I really hope it is not the heater core as that looks hard and time consuming. Also don't wanna fork about a ton of money on it. Any common issues or ideas to test the system? Car is coming up on 140k miles.


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post #2 of 5 Old 09-21-2017, 04:38 AM
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A leaking heater core stinks up the inside of the rig, not the engine bay. Radiator leaks can be fairly difficult to see in the cramped WJ engine bay. To make it a bit easier to see, spend some quality time using a flashlight to search for shiny traces of coolant along the edges of the plastic side tanks. The driver side is the most likely to crack first, since it gets the extra hot coolant coming from the engine. Things have cooled considerably by the time it goes through the cooling fins and makes its way to the passenger side.
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post #3 of 5 Old 09-21-2017, 06:02 AM
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2004 WJ 
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You can rent a pressure tester at autozone or advance auto parts. That's probally the easiest way to find a leak
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post #4 of 5 Old 09-21-2017, 02:37 PM
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Not sure if this can happen with a 4.7 WJ but I have 1995 Lincoln Town Car with a 4.6l (also have a 4.0 WJ). When I bought the car it was leaking coolant somewhere and the previous owner nor myself could really figure it out. I did a tune up not long after purchase and found out the intake manifold gasket was leaking and sending the coolant into the spark wells.
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post #5 of 5 Old 09-21-2017, 02:46 PM
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In my experience, the most common cause of "unexplained loss of coolant" is a bad pressure cap. You can have the cap tested, or just toss a new one in there. They don't cost much. You'd be hard pressed to spend more than a wallet sized portrait of Alexander Hamilton on one, even at a dealer parts counter.

I'm not arguing, I'm just explaining why my position is correct.
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