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Discussion Starter · #1 ·
I had a bulge on my upper radiator hose, replaced it (bottom one is fine). Then a few days later I was leaking what I'm sure is radiator fluid but not from the hoses or the radiator. An old wise man said that is a sign my water pump is going out?! Dealership said there is no leak and did a "compression test". I'm not a mechanic.... Any ideas? Suggestions? 4.0 ltr 2000 tj
Thanks!
 

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Could be the water pump. Water pumps have a small weep hole on the front that leaks when the seal inside the pump starts going bad. If you buy a new water pump, buy the OE factory water pump. Stores like Autozone sell cheap Chinese-made water pumps that even though they include a so-called "lifetime warranty", they aren't worth installing unless you like installing replacement water pumps 2-3X more often.
 

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Discussion Starter · #3 ·
Jerry Bransford said:
Could be the water pump. Water pumps have a small weep hole on the front that leaks when the seal inside the pump starts going bad. If you buy a new water pump, buy the OE factory water pump. Stores like Autozone sell cheap Chinese-made water pumps that even though they include a so-called "lifetime warranty", they aren't worth installing unless you like installing replacement water pumps 2-3X more often.
Right on. How difficult? Not really a "mechanic" but smart enough to figure things out..... I think. Also I have an extended powertrain warranty, wait till it goes and have the dealership fix?
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Not difficult but it's a bit of a PITA to do since it's not real easy to get to. I doubt the dealership will consider the water pump to be part of the drivetrain for warranty purposes.
 

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Discussion Starter · #5 ·
Jerry Bransford said:
Not difficult but it's a bit of a PITA to do since it's not real easy to get to. I doubt the dealership will consider the water pump to be part of the drivetrain for warranty purposes.
Nice. Maybe with the help of a Chilton manual?
Thanks for your feedback!
 

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Yeah, I have never had a dealer warrenty cover anything that was bolted to the engine. Getting them to cover internal parts is hard enough.
 

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Nice. Maybe with the help of a Chilton manual?
Thanks for your feedback!
I don't normally recommend Chilton's or Hayne's manuals (they try to cover too many model years in one small manual) but it should be fine for replacing the water pump.

If you swap the water pump yourself, here is one helpful hint to not forget... make sure to be extra careful to get every last smidgen of the old water pump gasket off the block before installing the new waterpump's gasket. Even a small seemingly microscopic piece of the old water pump gasket left behind can cause the new gasket to leak. Clean it, go back and clean it again, then get a small light so you can really see what you're doing and then wire brush it to make sure it's clean enough to perform surgery on. :)
 

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If it's not the hose then it's guaranteed to be the pump, the pump gasket or the pump shaft seal. Most pump shaft seals tend to 'go' around the 120k mark. The dreaded 'green drip' is usually the big tip off. The remark about getting a OE pump is right on as well. Chinese stuff is gonna croak in less than 10k miles. You really want to go thru this again in less than 6 months ? Best thing to do is, when you get the OE pump replacement, also have your timing chain done too. You're going to be more than 1/2 way there anyway and the pump needs to come off as a part of the process as well so why not ?
 

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also have your timing chain done too. You're going to be more than 1/2 way there anyway and the pump needs to come off as a part of the process as well so why not ?
I dunno, the timing chain is a pretty solid component that is good until at least the first major engine overhaul that isn't normally needed until 250-300K miles on the 4.0L.
 

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2002 Jeep TJ 4.0 Automatic with about a four inch lift, 35x12.50x15 Hercules tires
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Be sure to use HOAT formula antifreeze. This is a yellow antifreeze. The green is not the correct formula for Jeeps.
 

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Be sure to use HOAT formula antifreeze. This is a yellow antifreeze. The green is not the correct formula for Jeeps.
Hopefully he put the right coolant in otherwise he would have ran into more issues by now...you're about 8 years too late...lol
 

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Hopefully he put the right coolant in otherwise he would have ran into more issues by now...you're about 8 years too late...lol
I noticed after I posted.
 

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Still good to document ideas and solutions, even if the thread is old. Great resource for people in trouble for the first time with an issue.
 
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