Bubbling in Coolant Reservoir - JeepForum.com
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post #1 of 27 Old 02-12-2020, 12:02 PM Thread Starter
mquiroz
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Question Bubbling in Coolant Reservoir

Hello to all!

I own a 04 WJ 4.7L Grand Cherokee and I'm having intermittent bubbling in the coolant reservoir when I shut down the engine.

When I say intermittent, I mean that it doesn't happen always and it only happens when shutting down the engine.

The radiator was changed last December because the previous one had a crack in one of the plastic sections and the problem started after said radiator change.

Took it back to the shop where they changed the radiator and asked them to flush and purge the system, which they did and the problem persists, but as I said it doesn't happen always.

I've checked the engine oil and it is uncontaminated.

The temperature gauge stays right at the middle after it reaches operating temperature and has not gone higher.

I first noticed this situation after driving 2 hours at night on a highway and then it is more frequent when driving around in the city.

Any help and suggestions will be greatly appreciated.

Max

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post #2 of 27 Old 02-12-2020, 12:19 PM
007matman
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I wonder if your thermostat is sticking.

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post #3 of 27 Old 02-12-2020, 01:50 PM Thread Starter
mquiroz
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Quote:
Originally Posted by 007matman View Post
I wonder if your thermostat is sticking.

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They checked and apparently it was ok
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post #4 of 27 Old 02-12-2020, 02:15 PM
007matman
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They checked and apparently it was ok
There really is no test for that. They'd replace it and see if that fixes it.

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post #5 of 27 Old 02-12-2020, 03:09 PM Thread Starter
mquiroz
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There really is no test for that. They'd replace it and see if that fixes it.

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Thanks, I'll have them do it!
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post #6 of 27 Old 02-12-2020, 10:53 PM
Bigrigr
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Also, make sure they pay close attention to the bleeding procedure after they change it. I used about a 1ft piece of clear hose on a brass nipple at the coolant bleed port. It took about 45 mins of burping and topping it off to get all the air out of mine.

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post #7 of 27 Old 02-14-2020, 07:16 AM
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Next is a dissolved hydrocarbon test. This is how to find out if there is a head gasket leak and the persistent bubbles are actually exhaust gasses.
The shop will be familiar with that test or you can probably buy one at the parts store. The prior radiator having let go would have easily caused an overheat too and that would have made the HG also fail. If you never saw the gauge climb, it was because there was no coolant in the system to make contact with the sensor.

+1 on this engine being a trial to bleed though. I've normally had to let it purge by itself for about 3 weeks of near daily operation to get all air out.
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post #8 of 27 Old 02-14-2020, 01:45 PM
Bigrigr
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I got the clear hose trick from Martinbuilt, it worked like a charm. I have used it two or three times on various 4.7's and i never have an issue after the initial 45 minute wrestle...

'00LMTD-4.7l,242hd,D30,D44A,3.73's,True-trac front,Spartan rear,3"BBfront,2"BBrear,JK'sW/32's
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post #9 of 27 Old 02-14-2020, 02:51 PM Thread Starter
mquiroz
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Thanks to all for your replies. I will try to find if I can buy the kit in Mexico or if I will have to order it from the US.

I was thinking about checking the coolant temperature sensor to see if it works, what do you think about that?

Thanks again for your answers!!
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post #10 of 27 Old 02-15-2020, 09:39 AM
Bigrigr
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If you are talking about the bleeder hose, there is no "kit". You just need a brass nipple that will thread into the bleed fitting hole, and a 1 foot section of clear hose that will slip onto it. Easy Peezy

It wouldn't be a bad thing to double check that sending unit, just to eliminate it from the equation. But the sending unit and gauge won't make it bubble in the reservoir. It would only help you know why it was. Focus on the overheating first. Then worry about the gauge.

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post #11 of 27 Old 02-15-2020, 11:10 AM
2oldjeeps
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a cheap ir temp gun is a great tool for this

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post #12 of 27 Old 02-15-2020, 02:47 PM Thread Starter
mquiroz
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Quote:
Originally Posted by Bigrigr View Post
If you are talking about the bleeder hose, there is no "kit". You just need a brass nipple that will thread into the bleed fitting hole, and a 1 foot section of clear hose that will slip onto it. Easy Peezy

It wouldn't be a bad thing to double check that sending unit, just to eliminate it from the equation. But the sending unit and gauge won't make it bubble in the reservoir. It would only help you know why it was. Focus on the overheating first. Then worry about the gauge.
No, but thanks anyway.

I was talking about the Block Test Kit (Dissolved Hydrocarbon Test Kit).
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post #13 of 27 Old 02-16-2020, 04:20 PM
wjkeith
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Iíve never seen this symptom to be anything but trouble.
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post #14 of 27 Old 02-19-2020, 09:41 AM
Lloyd Vaughan
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Park on an incline, nose up, and let the engine run with the coolant cap off, this usually helps me burp engines quickly. Otherwise I fear there is a hair crack in a head causing this and it's just not noticeable yet. Just my 2 cents.
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post #15 of 27 Old 02-20-2020, 07:41 AM
Double E
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Disolved Hydrocarbon test will confirm.
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