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Old 03-05-2012, 09:00 PM   #1
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Question Help with my first project

I'll try to keep this short. I wanted to dive in and learn more than I currently do about cars, so I thought a jeep would be perfect to learn on, and a lot of fun. So I sold my sports car and bought a 93 YJ. I'm hoping this forum will be able to guide me on my journey to fixing up this jeep.

First up is the radiator;

Driving it home, it began to overheat after driving on the interstate. I had noticed the radiator was extremely dirty and neglected, so no big deal, I bought it to learn.

I flushed the radiator with Prestone Super Radiator Cleaner. I installed a flush tee and tried to back flush the system, but something blocked the water and it wouldn't come out the top of the radiator.

I have since flushed the radiator with two different cleaners. Now I've noticed two problems;

1.) A pretty substantial leak in the center, just below the gear shift. Not sure if I uncovered the leak with the cleaner or what happened.

2.) The water doesn't seem to be flowing in the radiator as it was before. Bad water pump?

I tried running leak stopping products through the system (actually tried it twice) but the leak still remains. Is this perhaps because the water pump isn't pushing the product to the leak?

At this point I can only drive a few blocks before it begins to overheat.

Here is what I don't want:
20 different people, each with 5 different things that could possibly be the problem.

What I'm asking you guys for:
Some direction; where do I begin diagnosing the issue? I will try to locate exactly where it is leaking from tomorrow morning. Should I be looking for a new water pump, or should I start somewhere else?

Thanks for any help, I'll try to put up pictures of this pile of junk as we build it into a nice ride.

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Old 03-05-2012, 09:55 PM   #2
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So...it is leaking inside the Jeep onto the floor? If that is the case it sounds like the heater core is where your issue lies, or one of your issues. You will notice under the hood that there are two hoses going into the firewall. You can bypass the heater core and get rid of one of the hoses and run the other in a loop to where the removed hose attaches. This will allow you to see if the rest of the system is working ok. This is of course a temporary solution for diagnostic purposes. If your heater core is the problem, be prepared for an education...they are a pain in the ass to replace.

The stop leak has been known to clog heater cores by the way.

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Old 03-05-2012, 09:56 PM   #3
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if the radiator was dirty and neglected, the rest of the system was too
you may have knocked some crud loose in the system and it is now blocking the radiator

try flushing each part of the system separately (heater core, block and radiator)
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Old 03-05-2012, 10:01 PM   #4
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I would stop the flushing and buy a new pump and radiator, also check the heater core for leaks. If that's the original pump it prolly has no impeller left on it.
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Old 03-06-2012, 12:23 PM   #5
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daddyjeep: The leak isn't inside on the floor, it's on the ground. I do plan on trying your method anyway, just to be sure it's not the heater core.

I'll also look up how to flush those systems separately and do that.

I'd like to only buy a $250 radiator if I know I need one, but I'm thinking I need a new water pump at least?
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Old 03-06-2012, 12:28 PM   #6
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I'd go ahead and replace the radiator, water pump, and thermostat. They all go hand in hand and it'd be a good learning experience. I'd go with an all aluminum radiator because most of the ones with molded plastic and aluminum end up cracking down over the years. If you don't mind spending a few extra bucks get a high flow water pump. That's my 2 cents, hope it helps.
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Old 03-11-2012, 04:26 PM   #7
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I'm replacing the radiator and water pump, and probably the thermostat. I've taken out the fan shroud and radiator and noticed a small hose that isn't going anywhere, wondering where it's supposed to connect. In the picture, the larger hose in the center is the lower radiator hose.
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Old 03-11-2012, 08:25 PM   #8
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From the picture it looks like it's the breather tube for the axle.
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Old 03-12-2012, 01:38 PM   #9
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So it's not supposed to go anywhere? cool.
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Old 03-12-2012, 03:38 PM   #10
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Might be a good idea to replace the radiator and heater hoses now while everything is already apart. If the cooling system was neglected there is a good chance the hoses were too.
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Old 03-12-2012, 03:43 PM   #11
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Quote:
Originally Posted by drift_gb View Post
So it's not supposed to go anywhere? cool.
Well, it's not supposed to drag in the dirt... You want to anchor it as high in the engine compartment as possible, so that you don't get water in your differential when off-roading.
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Old 03-12-2012, 08:44 PM   #12
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This should be on the end of the hose.
Axle Breather

There should be one of these hoses on the rear diff, front diff, transfer case, and some have them on the trans.
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Old 03-13-2012, 02:12 AM   #13
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You will notice under the hood that there are two hoses going into the firewall
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Old 03-20-2012, 10:31 PM   #14
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I have replaced the water pump, radiator, upper and lower hoses and...I still have a leak. I can't tell where the water is coming from, but it looks like it's dripping from the lower radiator hose and drive pulley. I've heard that some water might come from the weep hole when it's first filled, but this seemed like way too much fluid for that to be the case.

I was thinking/hoping now that I have a clean system some stop leak product should do the trick. But I'm also worried this means I have a much bigger problem. I'm also not too confident in my abilities, and the water seems to be coming from the general area of the water pump. But it seemed pretty straight-forward and I'm pretty sure that thing should be leak proof for a few years now.

What's the next step?
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Old 03-22-2012, 10:21 PM   #15
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I wouldn't run stop-leak thru a new radiator

Was it a new or reman pump? Did you get all the old gasket off?

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