Bubbles in Coolant Reservoir 06 Jeep Grand Cherokee - JeepForum.com
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post #1 of 7 Old 06-12-2019, 10:47 PM Thread Starter
joeydubb23
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Bubbles in Coolant Reservoir 06 Jeep Grand Cherokee

Hi guys, I need a little help, hopefully someone has had the same issue.

I seem to have air in my coolant system. The reservoir has bubbles in it constantly while the car is running.

Here is a video. ( will post the video link in comments Wont let me here.)

I've read the air could be coming from a number of places including the head gasket.

Does anyone know the first place to start looking for air leaks?

Should I replace the Radiator cap first?

When it comes to mechanics I am probably a 6 out of 10. I do mostly body work not mechanical things, so bear with me.

Here is some info on the car.

2006 Jeep Grand Cherokee Laredo 107,000 Miles 3.7 Runs fairly well. No issues. No Overheating, No rough Idle. No Leaks.

All help is very much appreciated.

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post #2 of 7 Old 06-12-2019, 10:51 PM Thread Starter
joeydubb23
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So it wont let me post my youtube link but if you google the title of my video it will come up


"Help With 2006 Jeep Grand Cherokee, Bubbles in coolant reservoir"

Youtube name "bit loud"
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post #3 of 7 Old 06-13-2019, 04:25 AM
caulk04
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08 Limited Hemi - wheels, tires, springs...ya know, stuff
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post #4 of 7 Old 06-13-2019, 04:26 AM
caulk04
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Unless you've recently serviced the cooling system in some way, the only way you're getting bubbles like that is from a head gasket.

08 Limited Hemi - wheels, tires, springs...ya know, stuff
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post #5 of 7 Old 06-13-2019, 06:09 AM
Nejeep
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Best way to confirm its a head gasket leak is to test for combustion gases in the reservoir. Parts stores sell testers for $40-50 or have a repair shop do the test.

06 Laredo - 4x4 V6 - Stone White - Custom LED Cargo Area Lights, Lighted Visors Added - now at 49k miles

97 Laredo - 4.0 4x4 Daily driver for 8 years then relocated to Arizona for 6 more years with the relatives
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post #6 of 7 Old 06-13-2019, 06:38 AM
RCS1300
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Looks like a head gasket to me as well. The combustion gas test is okay and works most of the time. A compression test in each cylinder may pinpoint which head has the bad gasket. A leak down test would be the best but that requires an air compressor and a special $125 gauge set.

I changed the heads on my 4.7L V8 due to a bad valve. It was not difficult but did require some special tools, a fairly complete tool set, and lots of patience. I am not a mechanic.
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post #7 of 7 Old 06-13-2019, 12:57 PM Thread Starter
joeydubb23
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Thank you for posting my video. Much appreciated.
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