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mystery overheating, please help????

alistair666 Oct 11, 2008

  1. alistair666

    alistair666 Member

    hi guys

    having a prob with my 2000 a3 1.8t sport

    noticed my dash temp gauge wasnt reading so changed the sensor
    and thermostat. Changing the thermostat i jost nearly all of the coolant, i filled it back up but now im having overheating problems

    car rises to temp as normal but gauge sticks at 90oc as if showing a false reading, fans dont come on and if left will boil. Have done the aircon code 51 check and that sticks at 90 as well. noticed the bottom hose comeing from the thermostat going to the rad stays cool all the others are hot

    had the water pump changed with the cam belt a few months ago

    thinking probably an airlock but not sure why gauge or fans wont work

    any help greatfully recieved
  2. golf

    golf ***** rent boy VCDS Map User

    Could be an airlock or the thermostat is not working as it should, assuming the water pump is still OK.
  3. Clach

    Clach A3 - 1.8Ts

    try the heaters, if thet get colder instead of hotter..it's the water pump
  4. Broken Byzan

    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User quattro Audi A4

    Either stat not opening cos its faulty or because is airlocked and not getting heated by water to operate correctly.She needs bleeding, i am not 100% where to bleed an A3 without checking, but i bet it via a heater hose the same as an A4
  5. alistair666

    alistair666 Member

    cheers guys

    im am getting hot air out the heater vents gonna take out the stat and check it in hot water

    could still do with some help with bleeding air out the coolant

    still a bit confused as to why the temp gauge just goes up to 90oc
  6. abdus

    abdus Top Gear VCDS Map User

    just try removing any air locks before anything else. while still cold, remove coolant expansion bottle cap, start engine, put blowers on full blast and leave it for some time.

    you should be able to see some bubbles coming out if there is any air lock.

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