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Need some help. 1.9tdi overheating problem

Discussion in 'A3/S3 Forum (8L Chassis)' started by doublem_1, Sep 10, 2013.

  1. doublem_1
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    doublem_1 Member

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    [Sep 10, 2013]
    Ok, my 2002 1.9tdi was overheating, one of the radiator pipes was hot and the other cold which suggested the thermostat. I had this replaced but it's still overheating, the coolant/want is bubbling and the doesn't seem to be any hot air coming through the vents. Can anyone suggest what the issue could be?
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  3. egesford
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    egesford Member

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    [Sep 10, 2013]
    water pump
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  4. doublem_1
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    doublem_1 Member

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    [Sep 10, 2013]
    How can you tell for sure if it is? My friend had a quick look and said there seemed to be water going back into the reservoir.
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  5. doublem_1
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    doublem_1 Member

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    [Sep 10, 2013]
    Are there any guides on replacing the water pump? Is it DIY?
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  6. gen.heinz guderian
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    gen.heinz guderian Well-Known Member Regional Rep VCDS Map User

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    [Sep 10, 2013]
    Was it an original/genuine Thermostat? Cambelt/tensioner should be replaced if doing water pump as well.
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  7. doublem_1
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    doublem_1 Member

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    [Sep 10, 2013]
    Yes it was an OEM part. The one removed was an Audi one too. It is a difficult task to replace the pump then?
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  8. egesford
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    egesford Member

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    [Sep 10, 2013]
    try running it without thermostat, if it still overheats you can rule that out.
    can you smell carbon in your coolant? if so possible HG failure
    temp sensor causes weird problems sometimes- cheap and 2 minute job
    check if rad is flowing- either disconnect top and bottom hoses and put hose pipe in top, or squeeze the top pipe and see if you can feel it in the bottom pipe.

    cambelt/water pump change is only a diy job if youre pretty competent
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  9. JimS3
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    JimS3 Active Member

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    [Sep 10, 2013]
    Are you loosing any coolant?
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  10. doublem_1
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    doublem_1 Member

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    [Sep 10, 2013]
    Yes as I need to top it up with water or coolant fairly regularly.
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  11. JimS3
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    JimS3 Active Member

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    [Sep 12, 2013]
    Head gaskets are common on these, they nearly always go between cylinder 2 or 3 and the adjacent waterway and you therefore rarely get the mayo tell tale signs in the oil. Under heavy load the high cylinder pressure over pressurises the coolant system and pushes it out the tube on the back of the coolant bottle.

    Good diy test for head gasket in these: get car warm one eve (almost up to temp) and then remove coolant reservoir cap to let pressure out. Drive for a bit longer to get fully up to temperature. Then leave the car over night to cool completely. Remove coolant bottle cap and if there is still pressure when its cold it's likely HG failure.
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