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audi newbie with hissing noise after engine shuts off

Discussion in 'A4/S4 forum(B5 Chassis)' started by thedukes, Jan 1, 2013.

  1. thedukes
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    thedukes New Member

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    [Jan 1, 2013]
    hi all, i have just brought an a4 which has been standing for a while 11 months ish, just had new mot on it, and drives amazing, its around 150k but drives like a much younger car, main question is

    when i switch off engine after a run there is a hissing noise from engine bay seems to be from expansion tank area.

    the length of time can vary not seemingly related to the length of drive.

    also have had a couple of times when temp sensor reads 60 on motorway then returns to 90 but not ever over in traffic???

    oil temp never seems to rise above 60 either??? am i missing something??

    please help am totally now an audi man but just learning the ropes

    regards luke.
    #1
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  3. Sandra
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    Sandra MODERATOR Staff Member Moderator

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    [Jan 1, 2013]
    Welcome to audi-sport.net Luke. The guys will help you with advice. Happy New Year and enjoy the forum. :) x
    #2
  4. NineNails
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    NineNails Proud sponsor of the snack food industry

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    [Jan 1, 2013]
    Hissing will be the air-con so don't worry. Prob best turn it off this time of year. Mines bust and I don't miss it
    #3
  5. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Jan 1, 2013]
    It could also be a bad seal on the expansion tank cap. Have a closer listen, if its the AC it will be coming from the battery area, rather than from the expansion tank itself.

    The temperature thing is probably the thermostat, get a new one fitted.
    #4
  6. thedukes
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    thedukes New Member

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    [Jan 3, 2013]
    hi guys

    yep its air con many thanks

    just discovered wet foot well last night, it seems after looking on forum its prob a blocked drain, i hopee to god it aint matrix!!! altho i dont loose any coolant yet:)

    i need to change front and rear brakes and discs got a quote for org spec

    front discs(pair) 60 inc
    rear discs (pair) 38 inc
    front pads 42
    rear pads 23

    i was thinking of upgrading but not got loads of cash, is it worth using grooved/drilled do they actually make a big diff say over just a better make of standard disk??

    any advise please.

    many thanks again

    luke
    #5
  7. Mackers
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    Mackers Member

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    [Jan 3, 2013]
    for brakes, look up MTECH BRAKES.... i cant fault them or their prices...... :D
    #6
  8. solarstu13
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    solarstu13 New Member

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    [Jan 6, 2013]
    Hi

    I have the same problem with my air con also , my car put the air con on its self and costing me a fortune in fuel i wonder if there is a fuse that i can pull to stop it ??
    #7
  9. Sulli79
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    Sulli79 Active Member

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    [Jan 6, 2013]
    Press the econ button on your climate control unit, that switches off the ac, you may need to press it again after selecting another mode
    #8

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