Welcome to the North American Subaru Impreza Owners Club Friday March 29, 2024
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC General > Warranty Issues & SOA Problems

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 07-02-2020, 01:56 PM   #1
Nway0455
Scooby Newbie
 
Member#: 408391
Join Date: Dec 2014
Location: Colorado
Vehicle:
2015 WRX STI Limited
Silver

Default Very small bubbling more like fizzing from upper radiator

So i have a 2015 Subaru WRX STI Modified with 57000 miles
-Blouch Turbo
-1050x Injectors
-TGV Delete
-Catless DP, Invidia Exhaust
-GrimmSpeed TMI
-Killerb oil pickup and oil pan
-ACT Clutch and flywheel
-Cobb SF Intake
-Walbro Fuel Pump

probably other stuff im forgetting

Anyways my issue (or hopefully non-issue) is i went to burp the coolant system today, not because of temperature issues but more just to stay on top of it (and i heard like a grumble after shutoff the other day kinda like a stomach ache) I noticed that there were very small bubbles like when you see other posts they mention dime size bubbles but im getting even smaller its almost like a soda fizz. This happens from cold start and tends to slowly dissipate as it reaches Operating temps. I've never really tried burping the system before aside from like one other time a year ago and i recall actually it doing the same fizzing thing. I've only added maybe idk 1/8th of a coolant bottle to the car in a year maybe less, coolant reservoir always between Low and Full never over, coolant has no odd smell or foreign substance in it from what i can tell, no milky oil and i mean i burn maybe half a quart in close to 3,000 miles with "spirited" driving but never really beating the piss out of it. Also worth mentioning i live in western Colorado where summer ambient temperatures are consistently 100 degrees and its at 4500 elevation and ive only seen my coolant temp go over 200 one time and it dropped right back down soon as i saw it. I suppose my fear is HG failure but i have like literally 0 symptoms besides the tiny bubbles in the upper radiator. Car runs great pulls great starts right up. But every forum i see with anything regarding this has more severe symptoms and is like "BLEW YOUR HG GOOD LUCK" any feedback is appreciated.
* Registered users of the site do not see these ads.
Nway0455 is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 07-02-2020, 03:56 PM   #2
Nway0455
Scooby Newbie
 
Member#: 408391
Join Date: Dec 2014
Location: Colorado
Vehicle:
2015 WRX STI Limited
Silver

Default

Also if wrong thread will someone move it? I seem to have a hard time navigating these forum pages
Nway0455 is offline   Reply With Quote
Old 07-30-2020, 04:02 PM   #3
neg_matnik
Scooby Specialist
 
Member#: 132389
Join Date: Nov 2006
Chapter/Region: BAIC
Location: SF Bay Area
Default

I would not worry about it until coolant starts to fall out from the coolant expansion/overflow tank next to the radiator.
Also, depending on how the HGs fail (if they fail), you may never get or see coolant in the oil (which is a blessing); you'll probably get some oil droplets in the coolant.
There again, these oil droplets will accumulate, over time, into the overflow tank.
All of these symptoms takes time to fully develop; initially, coolant started to overflow only when I was at the track after a full 20~25 mins session.
Then, it started happening after 15 mins of hard driving into the canyons and backroads.
Then, after a year or so, it happened after a 3rd gear pull to redline; a coolant hose to the turbo got loose. Put the hose back on, topped off radiator and drove back home.
I had lined-up all the tools and equipment I needed to do the job; I pulled the engine and did the work on my own.
neg_matnik is offline   Reply With Quote
Old 09-03-2020, 08:13 PM   #4
Nway0455
Scooby Newbie
 
Member#: 408391
Join Date: Dec 2014
Location: Colorado
Vehicle:
2015 WRX STI Limited
Silver

Default

Thanks for the response sorry for my delayed one. I just had my 60k maintenance work done. All fluids flushed. Ever since I’ve had him replace coolant and completely burp the system by his standards (he is from Italy and strictly works on performance vehicles blesssss) I’ve had no bubbling and my temperatures have dropped about 3 degrees from what it used to top out at on a hot day. So I was over reacting guess it was just air I couldn’t burp out myself.
Nway0455 is offline   Reply With Quote
Old 09-06-2020, 09:56 PM   #5
NighthawkSTI
Scooby Newbie
 
Member#: 495630
Join Date: Dec 2018
Default

Quote:
Originally Posted by Nway0455 View Post
So i have a 2015 Subaru WRX STI Modified with 57000 miles
-Blouch Turbo
-1050x Injectors
-TGV Delete
-Catless DP, Invidia Exhaust
-GrimmSpeed TMI
-Killerb oil pickup and oil pan
-ACT Clutch and flywheel
-Cobb SF Intake
-Walbro Fuel Pump

probably other stuff im forgetting

Anyways my issue (or hopefully non-issue) is i went to burp the coolant system today, not because of temperature issues but more just to stay on top of it (and i heard like a grumble after shutoff the other day kinda like a stomach ache) I noticed that there were very small bubbles like when you see other posts they mention dime size bubbles but im getting even smaller its almost like a soda fizz. This happens from cold start and tends to slowly dissipate as it reaches Operating temps. I've never really tried burping the system before aside from like one other time a year ago and i recall actually it doing the same fizzing thing. I've only added maybe idk 1/8th of a coolant bottle to the car in a year maybe less, coolant reservoir always between Low and Full never over, coolant has no odd smell or foreign substance in it from what i can tell, no milky oil and i mean i burn maybe half a quart in close to 3,000 miles with "spirited" driving but never really beating the piss out of it. Also worth mentioning i live in western Colorado where summer ambient temperatures are consistently 100 degrees and its at 4500 elevation and ive only seen my coolant temp go over 200 one time and it dropped right back down soon as i saw it. I suppose my fear is HG failure but i have like literally 0 symptoms besides the tiny bubbles in the upper radiator. Car runs great pulls great starts right up. But every forum i see with anything regarding this has more severe symptoms and is like "BLEW YOUR HG GOOD LUCK" any feedback is appreciated.
the fans come on at 207...so if you"ve never seen the coolant go over 200...thats not normal, unless your tune changed the activation temp for the fans. If you blew a head gasket you would have a pressure leak and lower pressure in the cooling system will cause higher temps. So its doubtful you have a blown head gasket.
NighthawkSTI is offline   Reply With Quote
Old 12-07-2020, 07:50 PM   #6
Nway0455
Scooby Newbie
 
Member#: 408391
Join Date: Dec 2014
Location: Colorado
Vehicle:
2015 WRX STI Limited
Silver

Default

Quote:
Originally Posted by NighthawkSTI View Post
the fans come on at 207...so if you"ve never seen the coolant go over 200...thats not normal, unless your tune changed the activation temp for the fans. If you blew a head gasket you would have a pressure leak and lower pressure in the cooling system will cause higher temps. So its doubtful you have a blown head gasket.
Yeah my tuner set the fans to come on I think in the mid 190s during the dyno session.
Nway0455 is offline   Reply With Quote
Old 12-15-2020, 08:05 PM   #7
NighthawkSTI
Scooby Newbie
 
Member#: 495630
Join Date: Dec 2018
Default

I'd just burp it again, and add coolant to the full mark on the resevoir when its cold. Otherwise doesnt sound like any cooling issues going on at all.
NighthawkSTI is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -4. The time now is 10:47 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2024 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.