Welcome to the North American Subaru Impreza Owners Club Friday August 18, 2017
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
Go Back   NASIOC > NASIOC Technical > Service & Maintenance

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. 
Thread Tools Display Modes
Old 11-15-2005, 02:09 PM   #1
Scooby Newbie
Member#: 100770
Join Date: Nov 2005
Default Help my diagnosis, please! Water pump or head gasket?

I have a Soob Legacy 2.2 liter. It has been erratically overheating. When it first started overheating I changed out the thermostat. It was fine at idle, fine around town but take it on the highway and it overheated. Tried another thermostat (hey they're cheap) and it worked around town and for a 10 minute drive at 65 on the highway. So I thought it was fixed and I went on a 150 mile drive and noticed 70 miles into it that the needle was about to break through the dashboard. It was at night, I had no money, all I could do was limp home turning it off on every downhill, coasting all I could, etc but it still got so hot that I melted the plastic cooling tower on the radiator. So I swapped out the radiator (BTW radiators.com is a great source for replacement radiators: $135, next day shipping and no S and H charges). I took it back on the highway. I went 20 miles at 70 MPH and it ran cool. Fantastic! But when I pulled off the highway and turned it off, opened the cap and topped off the coolant in the radiator things went sour. I got back on the highway for the 20 mile return trip and before I even got to the top of the onramp it started overheating again.

So, I'm confused. If the head gasket were broken wouldn't it overheat all the time? If it were the water pump wouldn't it over heat all the time? Could a belt be slipping some of the time and not all the time? What's my poor Soob's problem?

And I've only got 125K miles. Aren't these engines supposed to be "bulletproof"? I heard they put them in small aircraft they're so reliable.
* Registered users of the site do not see these ads.
porkboy is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 11-15-2005, 07:45 PM   #2
Scooby Specialist
Member#: 11808
Join Date: Oct 2001
Location: Cape Coral,FL

Since it runs cooler at speed and heats up at idle I would check to see if your cooling fans are operating. In addition: I've read on this NG that some after market cheap thermostates can cause overheating. Check cooling fans first.
Hayes is offline   Reply With Quote
Old 11-15-2005, 08:34 PM   #3
Scooby Newbie
Member#: 100770
Join Date: Nov 2005
Default It's the other way around.

It's not hot at idle, cool on highway. Other way around. Fans work fine. I checked those.
porkboy is offline   Reply With Quote
Old 11-16-2005, 12:27 AM   #4
Scooby Specialist
Member#: 89234
Join Date: Jun 2005

take your car to a shop and have the coolant checked for hydrocarbons. It's almost a guaranteed head gasket if the test is positive. It the water pump goes, it will make a noise or leak. Sounds like a head gasket.
solbey11 is offline   Reply With Quote
Old 11-16-2005, 12:43 AM   #5
Scooby Specialist
Member#: 41762
Join Date: Aug 2003
Chapter/Region: International
Location: House of Pancakes
04 STi
in ur Floriduh


Something as simple as a bad radiator cap can cause overheating too. If the system's not pressurized, coolant can start to boil and then spew out the overflow.
z is offline   Reply With Quote

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Head-Lifting or Head Gasket Problems Within.... maestro Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 38 06-01-2013 12:48 PM
Help on buying a used Legacy Outback. Head Gasket Help. Tirpitz56 Normally Aspirated Powertrain 3 06-03-2010 12:01 AM
FS: WRX NEW Water Pump and Front gaskets Shockster0429 Engine/Power/Exhaust 7 06-19-2009 07:15 AM
Water Pump & Thermostat Gasket Question Ramon_12345 Service & Maintenance 2 07-29-2008 08:38 AM
water pump with new gaskets Bill Private 'For Sale' Classifieds 4 12-03-2005 06:04 PM

All times are GMT -4. The time now is 05:15 PM.

Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2017 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.