Coolant disappearing with no visible leak - JeepForum.com
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post #1 of 29 Old 09-03-2021, 11:10 AM Thread Starter
Rylxmp
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Coolant disappearing with no visible leak

Hi guys I have another issue with 2003 4.7HO wj. Recently I had a slow coolant leak fixed which involved the mechanic replacing the t-stat, housing and both rad hoses. I also got a new duralast rad cap from autozone. Ever since I got the vehicle repaired, I have been losing coolant like crazy when compared to before (~0.4 gal/12 miles). The mechanic said that he found no other leaks after preforming a pressure test on the cooling system and also no signs of a bad headgasket. The rad cap doesn't heat up after I drive to work (12 miles) and the radiator hoses dont feel like they have much pressure or heat in them aswell after the drive.

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post #2 of 29 Old 09-03-2021, 11:48 AM
jw11432
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You could try a cooling system/radiator pressure test. It builds pressure over the radiator cap and you see if pressure drops after some interval of time (unsure of that time length). If it falls, you have a leak somewhere, be it outside or inside of the engine.

2004 GC Limited 4.7
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post #3 of 29 Old 09-03-2021, 03:04 PM
cDee63
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You have to check for combustion byproducts in the coolant, they make cheap testers that alert at the presence of CO2 in the coolant. I had a head gasket leak that had no symptoms for quite a while before showing itself. Well no symptoms other than coolant disappearing without a trace.

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post #4 of 29 Old 09-04-2021, 12:22 AM
Delta0
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How about a radiator sealer?

A radiator sealant that will work with your coolant.
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post #5 of 29 Old 09-04-2021, 01:17 AM
mak_v8
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The radiator cap should be rated to keep 18 psi pressure; if I were you, I would try using a Mopar cap and see if situation changes.

If it does not change, try what @cDee63 suggested: test the coolant for CO2 presence in it

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post #6 of 29 Old 09-04-2021, 06:48 AM
Delta0
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Originally Posted by mak_v8 View Post
The radiator cap should be rated to keep 18 psi pressure; if I were you, I would try using a Mopar cap and see if situation changes.

If it does not change, try what @cDee63 suggested: test the coolant for CO2 presence in it
I think it should be 17psi Mak.

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post #7 of 29 Old 09-04-2021, 07:07 AM
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post #8 of 29 Old 09-04-2021, 08:41 AM
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I had coolant issues for almost 2 years. The coolant level would be fine and then drop. No leaks until I touched the band clamp and then I would get a small leak every 2 weeks. Finally thermostat, and upper hose was replaced and I thought that cured it. No- started losing coolant again, mechanic found out my electric fan(4.0) was very hard to turn so that was replaced. I told him I had replaced the radiator cap with a Duralast one and he said the gasket was not sealing and he thinks that coolant was leaking out from the cap and burning off on the radiator. The radiator was also replaced as the side seam burst when it overheated. Have not had an issue with it since.

2001 Jeep Grand Cherokee WJ Laredo 4.0 purchased Sept 2014.
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post #9 of 29 Old 09-05-2021, 08:49 AM
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Absolutely Snowy.
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post #10 of 29 Old 09-05-2021, 11:41 AM
wjpaul
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When the mechanic refilled the radiator and block with coolant after the repair did he remove the bleed plug located where the upper radiator hose connects to the engine. If he didn't you will have air in your cooling system. I suggest you remove the plug, when the engine is cool, remove the radiator cap and have the proper coolant on hand. Start the engine and as it warms up and the T-stat opens add coolant as needed until it overflows from the bleed port. Button it all up and take it for a drive. See how your coolant level holds after a few days of use.

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post #11 of 29 Old 09-05-2021, 04:11 PM
RavenWJ
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I had an issue similar to this where I would be low in coolant. No visible leaks. I replaced the band clamps on my rad hoses with spring clamps like OEM. No more coolant loss.
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post #12 of 29 Old 09-05-2021, 05:41 PM
snowbuggy
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Quote:
Originally Posted by Delta0 View Post
Absolutely Snowy.

That low budget Chrysler eye roll emoji doesn't work very well. There isn't much difference between 17 and 18 lbs of pressure
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post #13 of 29 Old 09-06-2021, 12:39 AM
Delta0
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That low budget Chrysler eye roll emoji doesn't work very well. There isn't much difference between 17 and 18 lbs of pressure
Absolutely Snowy.
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post #14 of 29 Old 09-07-2021, 05:32 PM
Colt44
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You say there's no visible leak - if you're not getting any liquid on the driveway, be sure to look for evidence of dried coolant.


I hope it's not the case, but the problem could very well be a blown head gasket which would let coolant into the engine where it goes out the exhaust as steam.


Is the engine making white smoke? Check the oil - is it milky? If so, that's the problem.

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To interpret laws is almost always to corrupt them."

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post #15 of 29 Old 09-07-2021, 05:45 PM
T Hoff
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What WJPAUL said.

If there is no sweet smell while you drive and no wet areas around hoses or waterpump. I would guess, since the upper hoses aren't getting hot, that the system wasn't bleed properly.

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