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  #1  
Old July 29th, 2019, 18:52
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Greenspan Greenspan is offline
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98 XJ Leaking Coolant - Lower Hose or Pump?

98 XJ 160Kmi always had a little bit of a coolant leak but got worse over the weekend. It's been one of the hottest days of the year in LA and I've been driving around with A/C so probably have been stressing the system.

It looks like it is coming from the lower radiator hose. About a year or two I replaced the hoses with the Mishimoto radiator hoses. I remember struggling a lot with the lower hose connection with the engine. I got it on, but probably would have preferred to get it on a little bit more than I did. Hasn't leaked much since then so assumed it was okay.

Searching around it sounds like there is a weep hole on the pump that will leak fluid when the pump starts to go. Is there an easy way to determine if it is the water pump or the hose maybe just not on right? What water pump do you guys recommend these days?
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  #2  
Old July 29th, 2019, 19:39
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Re: 98 XJ Leaking Coolant - Lower Hose or Pump?

Take it to a shop that has a cooling system pressure tester.
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  #3  
Old July 29th, 2019, 23:12
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Re: 98 XJ Leaking Coolant - Lower Hose or Pump?

make sure the lower hose i tight. replace the lower hose and bleed the air out of the system as needed if leaking . Inspect the water pump for leaks. Water pumps are cheap and easy to replace .
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  #4  
Old July 30th, 2019, 14:09
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Greenspan Greenspan is offline
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Re: 98 XJ Leaking Coolant - Lower Hose or Pump?

Yeah, the problem is if I take off the lower hose all the coolant will drain out. I am leaning towards just assume it's the water pump and replace it anyway. What's the best water pump these days? Is the Flowkooler 1747 Water Pump any good?
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Old July 30th, 2019, 14:25
RCP Phx RCP Phx is offline
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Re: 98 XJ Leaking Coolant - Lower Hose or Pump?

Well the best would be Hesco but they don't come cheap.
http://www.hesco.us/products/7967/hi...5#.XUC1XfJKipo
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Old July 30th, 2019, 15:35
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Re: 98 XJ Leaking Coolant - Lower Hose or Pump?

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Originally Posted by RCP Phx View Post
Well the best would be Hesco but they don't come cheap.
http://www.hesco.us/products/7967/hi...5#.XUC1XfJKipo
Well I spend a lot of time in the desert, I'd rather do it right, thanks for the input I'll go with the Hesco then.
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Old July 30th, 2019, 18:30
Heavyopp Heavyopp is offline
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Re: 98 XJ Leaking Coolant - Lower Hose or Pump?

Is the rest of your cooling system set up for that Hesco Hi flow water pump?

Why not use a mopar pump? Just a quick search and it seems that it's still available
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Old July 30th, 2019, 21:58
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Greenspan Greenspan is offline
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Re: 98 XJ Leaking Coolant - Lower Hose or Pump?

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Originally Posted by Heavyopp View Post
Is the rest of your cooling system set up for that Hesco Hi flow water pump?

Why not use a mopar pump? Just a quick search and it seems that it's still available
How do I need to setup the system for that pump? Was planning on getting their high flow thermostat housing and thermostat too. I have a CFM 3 Core Radiator and Misihimoto Silicone hoses already.

Where did you find the mopar pump I couldn't find it.

I do a lot of wheeling in the Mojave desert. Cooling system is always on my mind. I would like to upgrade the water pump while I am replacing it if it makes sense. I don't mind spending the extra $150 on the pump if there will be some tangible benefit. Are there any negatives that I should be aware of?
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Old July 30th, 2019, 23:39
Heavyopp Heavyopp is offline
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Re: 98 XJ Leaking Coolant - Lower Hose or Pump?

Isn’t this the part # MOPAR PART # V9900083 — you need to verify part number for your year

Enter that in your search engine of choice — I see some on amazon and also on rock auto

I don’t run the high flow stuff, there does seem to be issues with pumping the coolant too fast — some are saying it doesn’t cool as well — there’s a thread talking about it right now — I think the title is “overheating problems solved” or something like that
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  #10  
Old July 31st, 2019, 04:50
denverd1 denverd1 is offline
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98 XJ Leaking Coolant - Lower Hose or Pump?

You'll know when your water pump goes. All coolant will leak out in a few minutes. Had the pleasure of replacing mine under a tree at Hidden Falls. I was 2 miles from camp and had almost no water in the system when I made it back.

OP check your oil. If you got it too hot, could be leaking coolant elsewhere

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  #11  
Old July 31st, 2019, 05:35
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Re: 98 XJ Leaking Coolant - Lower Hose or Pump?

All WP I've seen go bad get a small leak from weep hole. Try using a flashlight to see directly under the pulley. Doubt its the hoses unless they are installed wrong or clamp is loose.

For hot weather slow crawling I would recommend a high volume water pump but do check the other posts.
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  #12  
Old July 31st, 2019, 06:00
RCP Phx RCP Phx is offline
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Re: 98 XJ Leaking Coolant - Lower Hose or Pump?

I bought my Hesco pump as insurance for my new stroker. The only other thing I did was to make a hi-flow t-stat housing out of my existing neck. It's been perfect now for 2yrs.
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  #13  
Old August 1st, 2019, 20:04
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4x4JeePmaNthINg 4x4JeePmaNthINg is offline
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Re: 98 XJ Leaking Coolant - Lower Hose or Pump?

Quote:
Originally Posted by Greenspan View Post
98 XJ 160Kmi always had a little bit of a coolant leak but got worse over the weekend. It's been one of the hottest days of the year in LA and I've been driving around with A/C so probably have been stressing the system.

It looks like it is coming from the lower radiator hose. About a year or two I replaced the hoses with the Mishimoto radiator hoses. I remember struggling a lot with the lower hose connection with the engine. I got it on, but probably would have preferred to get it on a little bit more than I did. Hasn't leaked much since then so assumed it was okay.

Searching around it sounds like there is a weep hole on the pump that will leak fluid when the pump starts to go. Is there an easy way to determine if it is the water pump or the hose maybe just not on right? What water pump do you guys recommend these days?
Save your money and find your leak first. You can add cheap uv dye to your coolant and trace it that way. Pressure testers can be loaned from AZ or the like, which is free in the end, but not needed.

If you go real ghetto but effective chalk/ flower the area your thinking it's leaking and follow the newly wet trail of coolant.

If you don't know what's leaking don't spend money on random parts, I've had some odd leaks over the years and they were not close to where it seemed.

Uv is good stuff, + a uv light or cheap uv pen light.
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  #14  
Old August 1st, 2019, 20:48
lawsoncl lawsoncl is offline
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Re: 98 XJ Leaking Coolant - Lower Hose or Pump?

Quote:
Originally Posted by Patrick S. View Post
All WP I've seen go bad get a small leak from weep hole.

Most of the failures I've seen have also been small leaks. As the bearing wear, the added slop makes the seals leak. I had a 93 GC spit the bearing out the front, dump it's coolant and had the fan and belt flopping around. The previous owner dumped in a ton of stopleak that clogged up the bearing. I've seen a few with broken or spun impellers that the only clue was overheating.
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