Special additive for cooling system?

Discussion in 'General Motoring' started by Tony Hwang, Jul 1, 2004.

  1. Tony Hwang

    Tony Hwang Guest

    I got a mail today from Subaru saying they need to put in special
    additive to the cooling system which will take 15 mins. of time.
    What is this? Anyone got same mail?
    Tony Hwang, Jul 1, 2004
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  2. Tony Hwang

    Ken Lyons Guest

    So the finally got around to you? I don't know what is in it, but it
    miraculously extends the head gasket warranty to 100,000 miles. I have a
    feeling it is nothing more than a Stop-Leak type of chemical.
    Ken Lyons, Jul 1, 2004
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  3. Tony Hwang

    Edward Hayes Guest

    Do it as your warranty goes to 8 years 100,000 miles and yes it took my
    dealer about 15 minutes.
    Edward Hayes, Jul 1, 2004
  4. It is Subaru's fix for their leaking head gasket problem. They will no
    longer pay under the warantee to replace the head gaskets unless the
    additive fails to work. The offical Subaru name for this stuff is: Cooling
    System Conditioner. Part number SOA635071. The cost is about $1.75. Much
    cheaper for Subaru than having a mechanic replace head gaskets.

    The stuff is likely the same as Holts Radweld. Container is the same shape,
    same quantity (125 ml), same color (blue) container with a red cap, and even
    has the HOLTS name near the bottom. Also says "Manufactured in England for
    Subaru of America, Inc."

    See: http://www.holtsauto.com/products/index.html

    and look for Holts Radweld

    Ed Fortmiller | | Hudson MA
    * To avoid getting a lot of SPAM junk mail, I have altered my REPLY-TO
    * address. PLEASE remove the leading "RUBBISH" from my REPLY address.
    * Any Email sent to the address without removing "RUBBISH" will
    * automatically be discarded without me even seeing it.
    Ed Fortmiller, Jul 1, 2004
  5. Tony Hwang

    Jim Guest

    Takes about 15 minutes? If one whose car was past
    100K but has a very tiny weep of coolant visible wanted
    to add this on ones own, do you know if the coolant
    has to be new? It would seem not if they do it in
    15 minutes. Although there is a tiny weep of coolant
    visible near the bottom of my engine (I don't recall
    where exactly, it was shown to me in connection
    with diagnosing multiple oil leaks), I have never
    had to add any coolant...the system is full and the
    overflow tank has not dropped perceptibly.

    Jim, Jul 1, 2004
  6. Tony Hwang

    Mike Guest

    The dealer replaced the head gaskets on my '01 back in December. I've
    heard they try the sealer first now. I had the sealer added about a
    month ago, also bought an extra bottle ($1.50) for when I flush the
    system again.

    Mike, Jul 2, 2004
  7. Tony Hwang

    Henry Paul Guest

    So in other words, they haven't fixed the head gasket problem yet?
    Henry Paul, Jul 3, 2004
  8. Tony Hwang

    Marc Guest

    You remove about 4 ounces of coolant then add the conditioner
    (stop-leak)then run for a minimum of 15'. I personally would do it for
    longer with the heat for the cabin on as well. You must do this each time
    you change the coolant.

    For the poster with over 100k, is your engine one of the earlier 2.5 SOHC
    engines? Have you changed the t-Belt.

    I would consider swapping my water pump at the same time.

    Marc, Jul 3, 2004
  9. Tony Hwang

    X-Eliminator Guest

    I got a '99 Legacy 2.2 and I always see a little anti freeze weep on
    the thermostat housing (right under the water pump) , but I never see
    anti freeze spots on the garage floor.

    X-Eliminator, Jul 3, 2004
  10. Tony Hwang

    villager Guest

    Two weeks ago our 2002 outback blew a head gasket at 38,000 miles. It was
    an INTERNAL leak. Thankfully, it was covered under the regular warranty
    and so we didn't have to pay for the repairs. But this does raise many
    questiions and concerns. Since Subaru has been doing all the maintenance
    on our car including summerizing an winterizing, how come they did not see
    fit to put in the special coolant before this happened? (Or maybe they
    did)They did after the head gasket job.

    There is that 100,000 mile warranty but it is only available for outbacks
    with specific VIN #'s. Ours did not meet that criteria. Also this
    warranty only covers external leaks, not internal which our was. I am
    incredulous with the coolant additive as a cure for this problem. We will
    certainly be SOL if this happens again between 60-100,000. Why did Subaru
    build such an engine. Is there any recourse? Did my trade-in value just
    drop considerably because of this?
    villager, Jul 7, 2004
  11. Tony Hwang

    Edward Hayes Guest

    The coolant system conditioner is used to protect against EXTERNAL weepage
    from headgaskets and NOT for internal leakage. I think ALL 2.5L SOHC engines
    received the conditioner notice.
    Edward Hayes, Jul 7, 2004
  12. Tony Hwang

    villager Guest

    So why wouldn't the coolant work for internal leaks as well as external
    leaks? What would cause an internal leak that would require Subaru to
    make such a distinction? As far as we know we did not put undo wear and
    tear on this vehicle. As a matter of fact, this past year we parked the
    car from mid-Aug till mid May because of where we live during those
    months, there are no roads in town and no roads to town. We have to fly
    in. We did drive it around during christmas break and once or twice
    during the fall and in February when we were in the city. We do use it
    during the summer for travel and taking care of business. That should not
    have caused an "internally" blown head gasket.
    villager, Jul 7, 2004
  13. Tony Hwang

    villager Guest

    By the way, we never did receive notice about the conditioner.
    villager, Jul 7, 2004
  14. Tony Hwang

    Edward Hayes Guest

    Internally blown HG are caused by high combustion pressures of many hundreds
    of pounds per square inch of pressure. External seepage is caused by coolant
    pressure of on 15 lbs/sq inch
    Edward Hayes, Jul 7, 2004
  15. Tony Hwang

    Subbies Two Guest

    x-no-archive: yes
    Are located in the USA? If so, make sure that you are listed as the
    owner of record on the Subaru USA computer. If you have moved, they may
    not have your correct address.

    Does anyone know if this "service advisory" was sent out in other countries?

    Ed: I was told by my service writer that this letter went to all owners
    of 1999-2001 SOHC vehicles. And yes, it only covers external head gasket

    He also told me that this sealer is the "treatment of first resort" when
    a customer comes in with an external coolant leak on all SOHC vehicles,
    including those under warranty. If the sealer fails to cure the leak,
    then they tear down the engine and replace the head gasket. However,
    (under warranty) they only replace the gasket on the side that is
    leaking......... leaving the owner to constantly wonder when the gasket
    on the other side will fail, too.
    Subbies Two, Jul 7, 2004
  16. Tony Hwang

    Nicolas Dore Guest


    It is not sent out in Canada. Had to call Subaru Canada to confirm it was
    available and we don't get an extended warranty (yet)... :(

    Nicolas Dore, Jul 7, 2004
  17. Tony Hwang

    Henry Paul Guest

    Another thing you can do is let your car warm up for a minute or two in
    those cold temps before you go roaring off. That will give the engine a
    chance to adjust without a lot of stress on it.
    Henry Paul, Jul 8, 2004
  18. Hi,

    I had a long talk with my friend who owns a machine shop when I blew a
    Toyota head gasket. In one of our cooler Februaries (SoCal, so it
    doesn't get THAT cold!) He said the kind of use you describe is exactly
    what causes a LOT of blown headgaskets, regardless of make.

    His explanation was that colder weather causes much more
    expansion/contraction of the heads, gaskets, etc., and what happens is
    you go out one cold morning, fire up the engine when things are
    contracted, therefore "looser" than usual, and probably blow the gasket
    within a few blocks. He pretty much had my situation described

    On the bright side, he also said if you surface the heads the first time
    you blow a gasket, the chances of another blown gasket go WAY down. He
    said that's cuz the metal has pretty much done its shape distorting
    expansions and contractions--"cured" for lack of a better term--and now
    will hold a flat surface better. Again, he described perfectly what I
    experienced once the engine was buttoned back up.

    Since the Subie engine has more aluminum than most, it stands to reason
    perhaps there will be more "motion" of the metal in that engine,
    especially in widely varying temps. It's anecdotal, of course, but my
    Subie needs coolant about once a week during the winter, once every
    coupla months once it gets warm and thru the summer.

    Hope yours treats you well now that it's been fixed!

    Rick Courtright, Jul 8, 2004
  19. Tony Hwang

    John O Guest

    I've been missing a few messages the last couple weeks, so I apologize if
    this has been answered already...My '99 2.5l Outback wagon is well out of
    warranty, and replacing a head gasket is the last friggin thing I need right
    now. Should I get some of this additive as a precaution?

    BTW, I just got this car in February. Looking at the engine closely, it's
    been steam cleaned but there's some oil mess in places I wouldn't expect
    from normal use and refill spillage. Almost like the gasket blew once and
    it's been repaired already. Is that likely?

    -John O
    John O, Jul 8, 2004
  20. Hi,

    Previously replaced gasket's a possibility, but considering the car's
    five+ yrs old now, I'd also add valve cover gaskets, camshaft and front
    main seals to the list of suspects. A lot of people don't do it, but
    it's a good idea to replace these at each timing belt change.

    A sluggish or clogged PCV valve may also cause some oil leakage at the
    hose junctions. Take a quick look at the oil pressure sending unit, too.

    Rick Courtright, Jul 8, 2004
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