1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

1.8T Overheating?????

Discussion in 'A3/S3 Forum (8L Chassis)' started by happyarthur1979, Apr 6, 2008.

  1. happyarthur1979
    Offline

    happyarthur1979 Forever going forward!

    Joined:
    Dec 1, 2007
    Messages:
    20
    Likes Received:
    0
    [Apr 6, 2008]
    Hey guys,
    I know this has been covered before but cant find a difinitive answer to my problem.
    My car has started overheating. I replaced thermostat and temp sensor about 8 weeks ago. Car gets to operating temp as normal then creeps up. Hose from the thermostat housing to bottom of radiator stays cold throughout while other hoses get hot.
    Car is a 2000 1.8T Aum with just over 80k.
    Could this be a faulty thermostat? Or something worse like the water pump?
    Is there any test I can perform to check the if the water pump is u/s?
    Many Thanks, Graham.
    #1
  2. Ads

    Ads

    [Oct 25, 2014]

  3. abdus
    Offline

    abdus Top Gear VCDS Map User

    Joined:
    Apr 30, 2007
    Messages:
    1,826
    Likes Received:
    1
    [Apr 6, 2008]
    have you checked coolant level?

    what temperature does it sit?
    #2
  4. TheSpaceCowboy
    Offline

    TheSpaceCowboy Member

    Joined:
    Jan 24, 2007
    Messages:
    520
    Likes Received:
    0
    [Apr 6, 2008]
    Looking at it logically it would seem as though the waterpump is knackered. If one side of the cooling system is cold and the other piping hot its not pumping the water to dissipate the heat?
    #3
  5. HTC
    Offline

    HTC Active Member

    Joined:
    Jan 11, 2004
    Messages:
    3,413
    Likes Received:
    0
    [Apr 6, 2008]
    Start the engine and look at the coolant expansion bottle. There should be a jet of coolant squirting in from the small top hose. Get a friend to rev the engine up to 2000rpm. If you see no jet, then the pump is most likely fugged.
    #4
  6. happyarthur1979
    Offline

    happyarthur1979 Forever going forward!

    Joined:
    Dec 1, 2007
    Messages:
    20
    Likes Received:
    0
    [Apr 6, 2008]
    Thanks guys,

    Should I do this at operating temp or will it be the same from cold?

    Thanks Again!
    #5
  7. HTC
    Offline

    HTC Active Member

    Joined:
    Jan 11, 2004
    Messages:
    3,413
    Likes Received:
    0
    [Apr 6, 2008]
    It will be the same at any temp.
    #6
  8. happyarthur1979
    Offline

    happyarthur1979 Forever going forward!

    Joined:
    Dec 1, 2007
    Messages:
    20
    Likes Received:
    0
    [Apr 6, 2008]
    Ok cheers,
    I have just gone out and at operating temp with expantion cap off I increaded the revs to between 2 and 3k and there IS coolant returning to the tank via the small top hose.

    Would this mean the water pump is ok as there is coolant being pumped around the system?

    Could it be a that the thermostat is stuck closed?

    EDIT: ITS THE AGU ENGINE NOT AUM.....

    Thanks Again, Graham.
    #7
  9. bredhurststeve
    Offline

    bredhurststeve Member

    Joined:
    Sep 6, 2003
    Messages:
    103
    Likes Received:
    0
    [Apr 6, 2008]
    if it of any help mine was the water pump even though it was pumping water through the return into the expantion tank,
    #8
  10. abdus
    Offline

    abdus Top Gear VCDS Map User

    Joined:
    Apr 30, 2007
    Messages:
    1,826
    Likes Received:
    1
    [Apr 6, 2008]
    when was the cambelt and water pump done?
    #9
  11. happyarthur1979
    Offline

    happyarthur1979 Forever going forward!

    Joined:
    Dec 1, 2007
    Messages:
    20
    Likes Received:
    0
    [Apr 6, 2008]
    Ok Cheers,
    Gonna remove the thermostat tomorrow and use the old 'cup of hot water' trick to see if it opens.
    If not ill replace it, if it does ill have to put the car in and get it checked.
    #10
  12. HTC
    Offline

    HTC Active Member

    Joined:
    Jan 11, 2004
    Messages:
    3,413
    Likes Received:
    0
    [Apr 6, 2008]
    Does it overheat in slow traffic or when you are driving at higher revs?

    Maybe the pump impellor is slipping on its shaft?

    Whilst you have the thermostat out, you can shine a torch in a check the condition of the pump.

    Maybe you have been unlucky and the new thermostat is faulty. Happens from time to time.
    #11
  13. Dubplate
    Offline

    Dubplate Member

    Joined:
    May 22, 2007
    Messages:
    323
    Likes Received:
    1
    [Apr 8, 2008]
    just a thought....Is the fan coming on ? i had a similar problem on my corrado which turned out to be knackered bearings on the fan which caused it to intermittently switch off when the engine was hot.
    #12
  14. HTC
    Offline

    HTC Active Member

    Joined:
    Jan 11, 2004
    Messages:
    3,413
    Likes Received:
    0
    [Apr 8, 2008]
    Good call. Check the fan.
    #13

Share This Page