2003 WJ Coolant leak around the upper radiator hose. - JeepForum.com
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Unread 06-28-2012, 09:40 AM   #1
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2003 WJ 
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2003 WJ Coolant leak around the upper radiator hose.

Ok I've replaced the radiator and water pump and thermostat and I have a leak around the upper radiator hose. I have put two clamps on it and it still leaks somehow. It feels like there is alot of preasure in the line and im not sure if this is normal? It keeps taking fluid from the overflow and I keep having to add fluid about half a gallon a week. Any help would be great....

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Unread 06-28-2012, 09:42 AM   #2
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Is the thermostat in backwards?
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Unread 06-28-2012, 11:31 AM   #3
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Assuming your talking about the upper radiator hose that comes from the thermostat housing to the molded plastic of the raditator, look closely at the top that piece of molded plastic just past the little notch that tells you where to stop the radiator hose. Run your engine, get it hot and look to see if you have a small hair line crack?

I thought I had a hose issue and a mechanic took a look and showed me immediately the small hair line crack. This was just last Saturday on our '02 WJ. Apparently the cracking is common on these radiators. The strategic fix is to replace the radiator. Tactically based on feedback on this forum, was to buy JD Weld and cover the crack to seal it.

Sunday I bought the original JD Weld that handles 500 degree temps, and mixed it up dropped it over the crack, essentially making a pancake shape that cover all the crack and then some. Cured in 24 hrs and is hard as steel. Some on this forum have done this and they say it has lasted 2-3 yrs, others said it started leaking in a couple weeks.

I'm too early into the process to give you feedback, but for $6, it's worth a try. Remember to clean the area with acetone (finger nail polish remover) or alcohol and let dry, prior to the pancake.
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Unread 07-15-2012, 05:39 PM   #4
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I didn't want to make my own thread and don't want to hi-jack the OP's but I think I have a very similar problem. The leak is somewhere on the driver side of the radiator near (what I think) is the upper radiator hose.

Coolant splashed onto where the air filter goes.

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Unread 07-15-2012, 06:02 PM   #5
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It's not uncommon for the hose clamps to split the hose right under the clamp. I've had a few Jeep mystery leaks from splits in the hoses I couldn't see until I removed it. The hoses are so darn cheap, just replace them and move on. I've always felt like mine was carrying too much pressure in the system, but if it really were too much pressure I'd have had a problem. It's been 2 years with no symptoms other than a very firm upper radiator hose.
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