Bubbling in coolant reservoir - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 10 (permalink) Old 11-10-2017, 10:21 AM Thread Starter
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Bubbling in coolant reservoir

Is there any possible explanation for this other than a head gasket? It's NOT boiling - bubbling like a fish tank though . . .
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post #2 of 10 (permalink) Old 11-10-2017, 10:29 AM Thread Starter
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No overheating BTW.
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post #3 of 10 (permalink) Old 11-10-2017, 11:30 AM
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No overheating BTW.
Is the reservoir hot to the touch?

Or normal temperature?


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post #4 of 10 (permalink) Old 11-10-2017, 11:33 AM Thread Starter
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Is the reservoir hot to the touch?

Or normal temperature?
Hi Blue.

It's maybe warm at best - definitely not hot.
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post #5 of 10 (permalink) Old 11-10-2017, 11:38 AM
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Hi Blue.

It's maybe warm at best - definitely not hot.
If it's not hot enough to be causing the bubbling, possibly a vacuum leak somewhere causing the air bubbles you're seeing?

Just speculating.....


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post #6 of 10 (permalink) Old 11-10-2017, 11:44 AM
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When I swapped the 3.7 out there was so much air in the system it would bubble out the reservoir for days, also can be the radiator cap letting air into the system.
My guess is youíve got air getting into the system somehow and itís burping it like it should.
Heater cores, freeze plugs, hoses and clamps can be the culprits if the head gasket is good.


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post #7 of 10 (permalink) Old 11-10-2017, 12:45 PM Thread Starter
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Originally Posted by Conundrum2006 View Post
When I swapped the 3.7 out there was so much air in the system it would bubble out the reservoir for days, also can be the radiator cap letting air into the system.
My guess is youíve got air getting into the system somehow and itís burping it like it should.
Heater cores, freeze plugs, hoses and clamps can be the culprits if the head gasket is good.


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Thanks Conundrum - I think I may just change the hoses T Stat and cap and see if that works. I isolated the heater core (by-passed it) and that hasn't changed anything. . . .
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post #8 of 10 (permalink) Old 11-13-2017, 02:36 AM
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Generally if it is a head gasket leak, there will be some amount of carbon being released into the coolant. It floats on top once it hits the overflow tank.
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post #9 of 10 (permalink) Old 11-17-2017, 11:34 AM Thread Starter
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Pretty sure its a head gasket leak at cylinder 2 (this is on my 3.7L). Removed plugs one at a time, disconnected the fuel injector and ran the engine. When I pulled plug 2 out and ran it, I could see the steamy vapor coming out with each "puff."

Here's a question - I have one of those "pressure relieving" radiator caps. If I leave the level up (less pressure) I can allow the exhaust has to escape the coolant (and not add excess pressure to the system or trap air in my heater core). Anyone know why that's a bad idea? This 3.7 just needs to limp along for a while longer (kids car) - and I can't see dropping $1k on a new head gasket on an engine with 220k miles.
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post #10 of 10 (permalink) Old 11-20-2017, 11:45 PM
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Ouch. Itís pretty much screwed, I donít think any tricks will make a meaningful difference. Itíll be getting coolant in to the oil eventually killing the bearings.

For a patch job which I donít recommend there are headgasket sealer in a bottle that might, maybe seal the leak. Trouble being the flip side is it can screw up the rest of the cooling system, heater cores, thermostats, radiator, maybe passage ways depending. Itís a last ditch kind of gambit. Iíve known of it to work in extreme conditions but chickened put using it myself because I didnít want to risk having to replace most of the cooling system someday.

That kind of money to repair a 220k engine doesnít make sense, what you might want to consider is if you can limp it along long enough to be worth it try finding a low milage used engine to drop in, any Chrysler 3.7 from 2005-2012 will work, there are minor differences nothing of consequence really, just treat it like a long block swap, change over the the necessary hardware and sensors.

Actually any Chrysler 3.7 could work but the 2002-2004 need the reluctors changed for the 2005-2012 computer to work.


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