2006 STI Overheating!
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This is a discussion on 2006 STI Overheating! within the STi Technical Forum forums, part of the Tech & Modifying & General Repairs category; Hello All, this is my first post on this forum, I bought a 2006 STI yesterday and it has almost ...

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    2006 STI Overheating!

    Hello All, this is my first post on this forum, I bought a 2006 STI yesterday and it has almost 118K Miles on it. It is a clean southern california car. I drove it an hour or so yesterday to bring it home, and when I got here it began to run a little warm (the line above normal) then it would cool off and go back down to the normal position or below. This repeated a few times on cycles as I drove around town, and I thought maybe it was normal for these cars in traffic- because it seemed controlled. Soon enough though it started getting really hot- as I was on the highway I watched it start to quickly head towards the H from normal. I immediately put the car in neutral and turned it off while I coasted to the side of the road. It never made it into the thatched area by the H- brought it to a mechanic today- PO replaced orig thermostat at ~97k miles along with the radiator after similar issues. Said the rad was leaking when it was replaced.. Today the mechanic bled the air from the system and added almost 1/2 gallon of coolant that I probably lost yesterday. There is no oil in the coolant or coolant in the oil. Car does not steam..

    Is the thermostat suspect? Any other checks? This is my first Subaru and so far I have met two AAA truck drivers in the last two days.

    Thanks!
    Tim

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    Good news, everyone! xxxxxxxAnub1s's Avatar
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    That or the radiator again. If the person before you didn't use parts that are up to snuff, you could very well be just having the same problems as the owner before you. Aftermarket thermostats haven't ever really done well in Subaru's and seem to fail easy, though there are always exceptions to that. Replace with OEM thermostat from Subaru and a quality radiator if there is a problem with the one you have.

  4. #3
    The Default One SeattleJeremy's Avatar
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    Use a Subaru thermostat and an Aftermarket Radiator (The Subaru rad's are crappy).

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    Registered User c2bcoolwrx's Avatar
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    Quote Originally Posted by Anub1s View Post
    Aftermarket thermostats haven't ever really done well in Subaru's and seem to fail easy, though there are always exceptions to that. Replace with OEM thermostat from Subaru and a quality radiator if there is a problem with the one you have.
    I disagree, I have a crucial t-stat and it works great (my temps actually went down).

    To the OP:

    1st I would try burping the system. If that fails I would just flush the entire system and replace the fluid with a 30/70 ratio of coolant to distilled water (if it gets quite cold where you live use a 50/50 coolant/water ratio) and add 1 bottle of Redline Water Wetter.

    Lastly, here are 2 great thermostats (both have the failsafe to remain in the open position; the OEM fails in the closed):

    :: Crucial Racing Systems - Coolsafe Thermostat

    GrimmSpeed Thermostat
    Last edited by c2bcoolwrx; 11-02-2009 at 10:34 AM.

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    Moderator YBNormal07's Avatar
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    Quote Originally Posted by c2bcoolwrx View Post
    I disagree, I have a crucial t-stat and it works great (my temps actually went down).

    To the OP:

    1st I would try burping the system. If that fails I would just flush the entire system and replace the fluid with a 30/70 ratio of coolant to distilled water (if it gets quite cold where you live use a 50/50 coolant/water ratio) and add 1 bottle of Redline Water Wetter.

    Lastly, here are 2 great thermostats (both have the failsafe to remain in the open position; the OEM fails in the closed):

    :: Crucial Racing Systems - Coolsafe Thermostat

    GrimmSpeed Thermostat
    Ditto everything said here. Also, check for good circulation by doing a cold start with the Rad cap off, using a flashlight, and see how much turbulance you have in the water visually. Should be good flow. Water pumps are pretty stout, so my bet is you need a good fllush, fill, and burp (like a baby come to think of it)
    tEh PriUs=teH faSTah!@@!
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    Registered User JUSTINSNUTSWINGER's Avatar
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    Need to add the subaru conditioner as well. $2 bottle.
    N-swinger

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  8. #7
    Registered User Crb03's Avatar
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    My Crucial thermostat failed on me, after 5 months of use. I went back to stock. Redline water wetter works great too.
    "M3 drivers have no friends..." - Jeremy Clarkson

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    Registered User zeus32's Avatar
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    Quote Originally Posted by pzr2874 View Post
    Need to add the subaru conditioner as well. $2 bottle.
    What does the conditioner do? Is it only used when flushing the system?

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