The Top DSM Community on the Web

For 1990-1999 Mitsubishi Eclipse, Eagle Talon, Plymouth Laser, and Galant VR-4 Owners. Log in to remove most ads.

  • Join the Community!

    DSMtuners is a massive archive of DSM information - but more importantly, it's a COMMUNITY! Join in and participate with other DSMers, and invite all of your DSM friends to make this place their home. Chat with others, create a build thread, post questions and answers. Get involved! Logging in will also remove many of the advertisements, along with this notice. ;) It will also allow you to view images in threads.

Please Support Rix Racing
Please Support ExtremePSI

2G Coolant boil over/bubbles from radiator filler cap

954g63gst

Proven Member
208
17
May 24, 2012
gardner, Massachusetts
So I switched from stock fans to Mitsumoto and found out they draw more amps on the relay, the hard way So fans don’t turn on at the moment. I ordered a chase bay duel fan relay kit. But my main question is are these bubbles normal or from the video/pic can you identify a possible area to diagnose? I get a pencil eraser size bubble every 5 seconds for 15 min could be longer but car overheats do to fuses blowing and fans not turning on
You must be logged in to view this image or video.


You must be logged in to view this image or video.
 

1990TSIAWDTALON

Moderator
9,011
4,887
Nov 14, 2013
Independence, Kansas
I would check for a leaking head gasket. Your description fits the issue.
 

954g63gst

Proven Member
208
17
May 24, 2012
gardner, Massachusetts
So trying to fix a Mitsumoto slim fan not powering caused my coolant to empty out of the overflow. So I’ve been adding new coolant and I can’t get this bubble to stop reappearing. I think air is getting in threw the turbo if that’s possible is there a test? Boost leak test with cap off? Or any other suggestions?

You must be logged in to view this image or video.


You must be logged in to view this image or video.


You must be logged in to view this image or video.


You must be logged in to view this image or video.


You must be logged in to view this image or video.


You must be logged in to view this image or video.


You must be logged in to view this image or video.


You must be logged in to view this image or video.
 

Clipsoe

Proven Member
77
19
Apr 22, 2015
Fort Lauderdale, Florida
Use a radiator pressure tester and see if it holds psi. If not you'll either see a visible leak somewhere, maybe inside the car, heater core? Or, if you can't find a leak then it might be head gasket. You should be able to pump it to pressure, and use a spray water bottle with dish soap and spray all cooling lines (throttle body, heater core, turbo) and if there is a leak you should get bubbles.
 

CKOPOCT

Proven Member
55
34
May 27, 2017
North East, Maryland
It's possible to have a very minor leak in the head gasket where combustion pressure is forced into the cooling passages but little to no coolant gets into the chambers. Agree with both leakdown and boost leak tests.
 

954g63gst

Proven Member
208
17
May 24, 2012
gardner, Massachusetts
I believe you are correct on this one. Would also explain the spark plugs looking like they do. Does the car smoke while at idle?
Yes white smoke at idle. but it’s very cold where I live. It doesn’t smell sweet. And it goes away after 5-10 mins.
 

CKOPOCT

Proven Member
55
34
May 27, 2017
North East, Maryland
Probably standard condensation and not coolant leak then...

Any chance you have an air pocket in the system that is gradually resolving (hence the periodic bubbles)?
 

waltah

Proven Member
245
107
Mar 2, 2011
fairfield, Virginia
Probably standard condensation and not coolant leak then...

Any chance you have an air pocket in the system that is gradually resolving (hence the periodic bubbles)?
Many Mitsubishi engines require unusual procedures -- i.e., not just 'open cock ... wait ... close cock ... pour in coolant & done' to change coolant. I'm pretty sure the 4g63T is among them. If you've changed (or done anything that dumped some) coolant and refilled lately and the fussy procedure wasn't followed an air pocket is likely.

I believe other (non-shop manual) ways to fully fill our engines have been mentioned here recently. But I don't remember where.
 

JeffGS-T97

Supporting Member
999
688
Mar 22, 2019
Muncie, Indiana
When i did my BLT with a suspected blown HG i could hear was sounded like boiling water in the distance its very noticeable. My gasket compression blew long before it got to the exterior. The bubbly noise could be heard better when the engine was room temp.
 

TuskeeTuner

Proven Member
43
7
Dec 16, 2020
Everett, Washington
If you were leaking combustion gasses into the cooling system, you'd smell gas in your overflow bottle. You may also have oil slicks in your coolant.
 

954g63gst

Proven Member
208
17
May 24, 2012
gardner, Massachusetts
Coolant appears to be very clean. but I have a Mitsumoto coolant pressure tester being shipped to me to test the system and till then I can’t do much.
My radiator is out of the car I’ll pressure test that separately then install it.
I took my TB off to redo the seals and install thermal gaskets along with the intake manifold.
My injector # 3 leaked bad on boost test as well so I got a new seal kit.
I blocked off the FAIV on the TB.
Once I test the radiator I’ll reinstall everything and pressure test the whole system.
 
Support Vendors who Support the DSM Community
Boosted Fabrication ECM Tuning ExtremePSI Fuel Injector Clinic Jacks Transmissions JNZ Tuning Kiggly Racing Morrison Fabrications MyMitsubishiStore.com RixRacing RockAuto RTM Racing STM Tuned VR Speed Factory

Latest posts

Build Thread Updates

Vendor Updates

Latest Classifieds

Top