Coolant leak? Losing coolant. - JeepForum.com
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post #1 of 22 Old 09-01-2012, 02:09 PM Thread Starter
JohnC7
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Coolant leak? Losing coolant.

I been having some coolant leaks for the last while. I checked the radiator and found a hairline crack on the left (facing the windshield). The side of the radiator where the crack is seems like metal. So I sealed it off with 100% silicone for a temporary fix. That leak stopped because there was no pooling below the radiator, but I was still losing coolant. I'm not talking a little bit, I mean I would fill my resivour to full and it would go down after a trip.

Today I was removing a 2 or so month old oil pressure switch when I noticed a hose connecting to the top of the resivour and followed it but it was cut off. Here are some pictures. Also theirs a plug in the picture that wasn't connected to anything?

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post #2 of 22 Old 09-01-2012, 04:27 PM
sskilla
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is that the hose thats supposed to connect to the radiator just under the pressure cap?

'95 ZJ: 5.2 v8 / 231 Tcase / 46RH
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post #3 of 22 Old 09-01-2012, 04:32 PM Thread Starter
JohnC7
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No it was tucked away in a corner. I read up and apparently it's the over flow drain. I though I was onto something about my leak. Weird thing is my temperature is always at 100. Also just recently I would remove the radiator cap to see if I was losing coolant in the radiator but that was always full till now.
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post #4 of 22 Old 09-01-2012, 04:33 PM
sskilla
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always at 100??? sounds like your thermostat is stuck open.

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post #5 of 22 Old 09-01-2012, 04:36 PM
Agent620
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I think he means 100C as he is in Alberta.

Have you checked to see if the water pump is leaking? Also make sure its not leaking into your engine. I think the term is head gasket?
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post #6 of 22 Old 09-01-2012, 04:41 PM
sskilla
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Quote:
Originally Posted by Agent620 View Post
I think he means 100C as he is in Alberta.

Have you checked to see if the water pump is leaking? Also make sure its not leaking into your engine. I think the term is head gasket?
ahhh, that does make more sense, my fault.

and i agree, if you're loosing coolant and you dont have puddles, check your oil and exhaust color to make sure its not leakin into the motor.

'95 ZJ: 5.2 v8 / 231 Tcase / 46RH
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post #7 of 22 Old 09-01-2012, 04:56 PM Thread Starter
JohnC7
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I actually live in British Columbia I checked my oil and it was clean (dark but clean) no muddy coloration. How do I check the water pump? I have the 4.0L. Also how do I check the exhaust color and what should I look for?
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post #8 of 22 Old 09-01-2012, 05:19 PM
ratmonkey
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it's either going on the ground, through the engine, or into the engine. no drips on the ground and no milky oil leaves only one possibility.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #9 of 22 Old 09-01-2012, 05:27 PM
AVR2
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I had an "invisible" coolant leak for a long time. There were no drips under the engine after it had been left standing, I couldn't see pooling on the crossmember under the rad, and there was no evidence of coolant in the oil. In the end it turned out that there was a hairline crack in the rad side tank, and the coolant was blowing away while the Jeep was being driven.

Almost immediately after I'd fixed that problem (new rad, plus new water pump etc) I discovered coolant dripping onto the exhaust. It was a rusted freeze plug.
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post #10 of 22 Old 09-01-2012, 05:34 PM Thread Starter
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Quote:
Originally Posted by AVR2
I had an "invisible" coolant leak for a long time. There were no drips under the engine after it had been left standing, I couldn't see pooling on the crossmember under the rad, and there was no evidence of coolant in the oil. In the end it turned out that there was a hairline crack in the rad side tank, and the coolant was blowing away while the Jeep was being driven.

Almost immediately after I'd fixed that problem (new rad, plus new water pump etc) I discovered coolant dripping onto the exhaust. It was a rusted freeze plug.
This is exactly the same. Exactly the same. When I pull it in the garage and idle it, no drips or pooling. I do have a hair line crack on the left side covered by silicone for a temp fix.

How would I check this "freeze plug"? Also is their a better fix for the hair line crack? Other then a new rad. I heard JB Weld, Canadian tire carries a high heat epoxy stick or marine weld epoxy stick?
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post #11 of 22 Old 09-01-2012, 07:29 PM
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My radiator developed the same problem with the hair line crack and the fan was blowing it around. I changed the radiator, and while I was at it, the water pump, thermostat, radiator cap and all of the hoses. The total was under $250 for everything from buying the parts online at Rock Auto.com The Spectra Premium radiator has held up very well for me. Personally, I am not a fan of temp fixes unless I am trying to get the Jeep home to fix it.
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post #12 of 22 Old 09-01-2012, 07:53 PM Thread Starter
JohnC7
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A side note, is this part of the radiator metal? If so I can get it welded for a fix. Also, where are the freeze plugs so I can check them to see if they are the issue?

Thats the silicone covering the crack in the picture.
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post #13 of 22 Old 09-02-2012, 03:38 AM
AVR2
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The freeze plugs are on the driver's side of the engine underneath the intake manifold and exhaust header. Since they're mostly obscured by the exhaust header they can be difficult to see. They're the brass circles on the side of the engine here:



Unless they've previously been replaced on your engine, you won't have non-corroding brass ones, they'll be the cheapskate factory steel, and they'll be the same colour as the rest of the engine.
Apparently there's one more on the end of the block facing the firewall, which you can only replace by pulling the engine.
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post #14 of 22 Old 09-02-2012, 02:08 PM Thread Starter
JohnC7
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Yea I don't think I got the money not the resources to put in new freezer plugs. Hahah, I'm going to look into soldering the crack in my radiator though. Also get it pressure tested. Thanks alot every one, real helpful!
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post #15 of 22 Old 09-02-2012, 02:43 PM
96zedjay
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Spend the money and replace the Rad.... You won't regret it...... When the Rad splits wide open and your out in the middle of nowhere and the motor toasts itself and your about to freeze to death, well, you get the idea.
A lot of the Canadian/Northern American Jeeps came with block heaters that fit into one of the freeze plug holes (proper term is core plug). These were notorious for leaking as well.
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