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  1. #1
    Saab Fan
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    2003 Vector vert
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    Water pouring out the overflow exspansion bottle

    2003 Vector vert 106k
    After the car started over heating
    Water would pour back into the exspansion bottle 60% of the engines coolant is lost

    I thought the head gasket had gone
    Jobs i have carried out
    Replaced the thermo stat
    Checked the Fan..ok
    Replaced the head gasket
    Oil and filter

    I drove 35 miles test drive yesterday
    Stopping every 10 miles to check all was ok
    Various speeds 50-70mph
    All was ok

    I returned home lifted the bonnet
    Engine was ticking over

    Then the water under great pressure started to blow back into the exspansion bottle
    And out the overflow

    I turned the engine off
    It continued to pour out the overflow at an alarming rate dumping 60% of the new coolant on to the road

    No idea what to do now
    I replaced the cap and cleaned out the exspansion tank

    The cooling system was carefully filled through the top hose and exspansion tank

    The lack of water on a motorway caused the head gasket to blow.. the head was removed and skimed flat

    Its a massive job i am so dissapointed the problem is still there
    I have heard mentioned reverse flow of the turbo water way due to the engine breather..?
    Can any one please exsplain
    Thank you peeps. Im sure others must have had the same problem
    How do i fix this!! Just spent 600!
    Phil

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  2. #2
    Saab Owner Digger's Avatar
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    2006 9-3 2.0t SportCombi
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    Adding the engine size is always a good thing to do when asking an engine question, but what you have here sounds more like a cooling system question and my question to you is: Does your radiator fan work?

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  3. #3
    Saab Fan
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    2003 Vector vert
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    Quote Originally Posted by Digger View Post
    Adding the engine size is always a good thing to do when asking an engine question, but what you have here sounds more like a cooling system question and my question to you is: Does your radiator fan work?
    Morning Digger
    nice of you to Reply 2.0L
    yes the fan is working, However no way to tell ?
    if its working all the Time or coming on when it should

    the problem lies in reverse flow..?
    i read on another thread when the turbo is
    hot it can some how reverse the flow as
    the top pipe from the exspansion bottle
    goes directly to the turbo it makes some sence

    the blow back of coolant certainly comes
    from the turbo pipe

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  4. #4
    Bruno
    Saab Addict swisssaabist's Avatar
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    18 Nov 2016
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    9-5 ARC Wagon 2002 2 t auto engine B205E
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    when you have changing swapping the thermostat do you have paying attention to the small pin goes upper ?

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  5. #5
    Saab Fan
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    2003 Vector vert
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    Quote Originally Posted by swisssaabist View Post
    when you have changing swapping the thermostat do you have paying attention to the small pin goes upper ?

    Hi the stat can only go in one way
    the problem lies i think in the turbo reverse flow

    pressure from the turbo is charging the water system
    maybe the cast iron is cracked..?

    it only does it when the car has driven hard
    and the boost is used at pressure..?

    is there a pressure realise or dump valve on
    the turbo..?

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  6. #6
    Saab Owner Digger's Avatar
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    2006 9-3 2.0t SportCombi
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    Fan coming on is one thing, fan moving enough air to carry Dorothy and Todo from Kansas to OZ is a horse of a different color. I know this type of turbo car problem and it's not Saab specific. There are several causes beyond the cooling fan, but checking to see if the fan blows air volume needed is fairly easy.

    Turning on the AC should get a fan spinning full time while driving and if that stops the overflow you look to the circuit that controls the cooling fans.


    The turbo does have a waste gate and that can cause problems, but we don't have intercoolers so the cause you're questioning is highly unlikely. You can test the coolant for compression gas and if the head was magna fluxed when it was milled, the most likely place to find this would again be the head gasket and I have to ask if the head bolts were replaced with the gasket?

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  7. #7
    Saab Fan
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    2003 Vector vert
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    Quote Originally Posted by Digger View Post
    Fan coming on is one thing, fan moving enough air to carry Dorothy and Todo from Kansas to OZ is a horse of a different color. I know this type of turbo car problem and it's not Saab specific. There are several causes beyond the cooling fan, but checking to see if the fan blows air volume needed is fairly easy.

    Turning on the AC should get a fan spinning full time while driving and if that stops the overflow you look to the circuit that controls the cooling fans.


    The turbo does have a waste gate and that can cause problems, but we don't have intercoolers so the cause you're questioning is highly unlikely. You can test the coolant for compression gas and if the head was magna fluxed when it was milled, the most likely place to find this would again be the head gasket and I have to ask if the head bolts were replaced with the gasket?
    Hi Digger

    I am Happy the head gasket is fine now
    new bolts. head Skimmed torked down
    3 stages final with an Angle gauge

    getting a bit off topic here

    when the engine is switched off
    the fan runs as it should
    the coolant blow back is coming from
    the top pipe. Which goes to the Turbo

    what do you call the cast iron union
    with the water inlet and return .and oil feed pipes ?. between the
    turbo and cat..?

    this seems a common problem i have seen a few
    threades about it I‘m hopeing that a mechanic who has
    an answer will pop up

    it only dumps the engine coolant
    when its switched off after a hard run

    drove 130 miles gently no probs or coolant
    loss temp is fine heater works
    engine is running sweet ..?



    How fragile is the return coolant pipe
    from the turbo to engine.. it runs right under the manifold
    i read thats its lined with porcelain and can be obstructive.?

    what i‘m trying to do now is avoid further exspensive trial
    and error exsperiments

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