Welcome to the North American Subaru Impreza Owners Club Friday July 25, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Factory 2.0L Turbo Powertrain

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.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 12-09-2012, 01:47 PM   #1
121
Scooby Newbie
 
Member#: 247832
Join Date: May 2010
Default Coolant level going up and down

hello,
recently got a WRX 2004. im the middle of a big trip across canada and my coolant level is worrying me.

i drove 900 miles in the past 2 days and checked the coolant in the reservoir and it was under the Low mark. Topped it up to the middle and drove another 300 miles. checked it this morning and it was again a bit under Low. topped it up to the three quarters of the reservoir in the morning before leaving fearing that i could have a leaking somewhere. checked it for leaks and theres, apparently no leaks. drove another 60 miles and checked for coolant with engine still hot and it was way above FULL ??

its been really cold those days (around 20F) and my question is it possible that the coolant is being kept inside the circuit when stopped for a long time to protect engine from cold and taken back to the reservoir when engine hot ?

my oil looks good, though very full, and coolant in the radiator is the color it should be.

would appreciate any help, thank you.
* Registered users of the site do not see these ads.
121 is offline   Reply With Quote
Old 12-09-2012, 01:48 PM   #2
121
Scooby Newbie
 
Member#: 247832
Join Date: May 2010
Default

btw, no overheating and we are pretty loaded.
121 is offline   Reply With Quote
Old 12-09-2012, 02:03 PM   #3
02MBPWRX
Scooby Newbie
 
Member#: 310772
Join Date: Feb 2012
Chapter/Region: TXIC
Location: El Paso, TX Born Houston, TX
Vehicle:
2002 WRX
MBP

Default

Do you smell any coolant burning in the engine bay when the car has been running? Is there any white smoke coming from your exhaust when revving? Coolant can only leak or burn. Otherwise it just recirculates. The level in the resevoir tank varies at times.
02MBPWRX is offline   Reply With Quote
Old 12-09-2012, 02:04 PM   #4
2002Bugseye
Scooby Newbie
 
Member#: 294245
Join Date: Sep 2011
Chapter/Region: NESIC
Location: Baltic, CT
Vehicle:
2002 Impreza WRX
Platinum Silver

Default

The owners manual should state whether to check the coolant with the engine warm or cold. Sounds to me like you have nothing to worry about.

When the engine is hot, the coolant expands and flows out through the radiator cap into the overflow tank. When the engine is cold, the coolant does the exact opposite and condenses (Not in the sense of water condensing on a window, just molecularly gets smaller) and creates a vacuum which in turn causes a vacuum in the system which draws coolant back in from the overflow tank.
2002Bugseye is offline   Reply With Quote
Old 12-09-2012, 02:04 PM   #5
121
Scooby Newbie
 
Member#: 247832
Join Date: May 2010
Default

no, no smells in the engine bay. the smoke is white so as all the cars surrounding me, its so cold...
121 is offline   Reply With Quote
Old 12-09-2012, 02:07 PM   #6
121
Scooby Newbie
 
Member#: 247832
Join Date: May 2010
Default

Quote:
Originally Posted by 2002Bugseye View Post
The owners manual should state whether to check the coolant with the engine warm or cold. Sounds to me like you have nothing to worry about.

When the engine is hot, the coolant expands and flows out through the radiator cap into the overflow tank. When the engine is cold, the coolant does the exact opposite and condenses (Not in the sense of water condensing on a window, just molecularly gets smaller) and creates a vacuum which in turn causes a vacuum in the system which draws coolant back in from the overflow tank.
okay, thats reassuring but could it make such differences in the reservoir (from middle level to too Full ?
121 is offline   Reply With Quote
Old 12-09-2012, 03:10 PM   #7
johnfelstead
Scooby Specialist
 
Member#: 856
Join Date: Feb 2000
Chapter/Region: International
Location: Hampshire, England, UK
Vehicle:
2005 JDM STi
Black

Default

When the engine is stone cold, take the header tank filler cap off and check the level in there. If it is full you have nothing to worry about. If it isnt full, top it up and then set your expansion tank level to full.

The water level in the expansion tank should then go above full when it gets hot, and then drop down to between full and low when it's cold.
johnfelstead is offline   Reply With Quote
Old 12-09-2012, 04:31 PM   #8
bluestone
Scooby Specialist
 
Member#: 36583
Join Date: May 2003
Chapter/Region: SCIC
Location: Irvine, CA
Vehicle:
2004 WRX sedan
Aspen White

Default

I have the opposite problem. The level in my overflow tank is stuck like a rock and never moves. Radiator and upper reservoir tank are full. Operating temps are 200-207.
bluestone is offline   Reply With Quote
Old 12-16-2012, 08:12 PM   #9
121
Scooby Newbie
 
Member#: 247832
Join Date: May 2010
Default

Finally it was just the cold that made the coolant retract. Thanks for everything guys!
121 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 06:12 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.