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  1. #1
    Registered Member One Ring
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    2000 Audi S4
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    HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

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    hey everyone,

    i have an 2000 Audi S4 and i have a problem
    every week (once a week), i am having to refill my antifreeze.
    for some reason it keeps on decreasing
    There is absolutely NO leak at all
    i took it to a mechanic and they have no clue whats wrong, they say there isnt any leak at all.
    A friend of mines suggested to keep refilling it with water for now (since its only summer) and then just put antifreeze when winter comes
    what the hell do i do, and whats wrong??!!

    thankssss in advance!

  2. #2
    Veteran Member Four Rings HotSauce's Avatar
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    Jul 26 2004
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    2909
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    MPLS/ATL

    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    Get a new mehanic. It's either leaking (check aux water pump) or a blown head gasket. I'd put a whole hell of a lot of money on the former.

  3. #3
    Veteran Member Four Rings mholme's Avatar
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    Jan 29 2007
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    08 S4 00 S4
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    MD
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    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    It has to be going somewhere. Did he check the afterun pump under the intake manifold? How's the car running?
    08 S4- Stock

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  4. #4
    Senior Member Two Rings
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    Jul 10 2009
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    2001.5 S4
    Location
    Boston

    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    do you smell G12? I had a leak and had trouble finding it but the smell of G12 was strong... also when my after run pump was leaking same thing...

    Open the hood and you can smell it, unmistakable... I would say after run pump or the bottom of the overflow tank, look all the way under it is hard to see...

  5. #5
    Registered Member One Ring
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    Aug 09 2009
    AZ Member #
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    My Garage
    2000 Audi S4
    Location
    Floral Park, NY

    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    Quote Originally Posted by mholme View Post
    It has to be going somewhere. Did he check the afterun pump under the intake manifold? How's the car running?
    well its my first car so i dont think i would notice any much differential. But it runs fine i guess, its not too its full potential because it needs o2 sensors, which i am going to get done soon.

  6. #6
    Veteran Member Four Rings mholme's Avatar
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    08 S4 00 S4
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    MD
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    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    Alright, well if your mechanic said there's no leak and offered no other possibilities, it's definitely time to find a new mechanic. Pressure testing the coolant system and checking the afterun pump is where I would start if there are no visible leaks.
    08 S4- Stock

    00 S4-APR 93 Piggies Custom True Dual exhaust AWE DTS ECS/Bilstein Coilovers 710N's Samco TBB Omori 52mm boost gauge SOLD

  7. #7
    Veteran Member Four Rings Mooseimage's Avatar
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    Feb 15 2008
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    2004 Audi Allroad
    Location
    Sacramento, CA

    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    If your leaking, check to see where a puddle might build up underneath the car. I recently found my leak, which was the coolant temperature sensor behind the engine, the gasket was deteriorated to shit. Replaced it and no leak. If no visible puddle/drops underneath the car, could be one of the above mentioned by the other posters.
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  8. #8
    Veteran Member Three Rings saucys4's Avatar
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    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    my guess is that you're overfilling your coolant reservoir. the coolant level should rest at the "min" line on the expansion tank.
    Arrogant Bastard

  9. #9
    Senior Member Three Rings kingofqueenz788's Avatar
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    Jan 11 2007
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    audi s4 2000
    Location
    NewYork, NewYork

    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    hey if u want i can help u find your leak im 1 town over and also own a b5 s4 im verry knowledgable n wont charge you to take a look at the car!
    BUY >ME< help the s4 fund :-) 1997 vw jetta cleann!!!!http://forums.vwvortex.com/zeropost?cmd=fshow&id=811

  10. #10
    Veteran Member Four Rings W1CK3D's Avatar
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    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    I'd put money on the aux water pump

    Take it to a new mechanic, that much fluid should be easy to spot
    Current: 2002 Nogaro B5S4
    Gone: 2006 Dolphin Grey B7S4
    Gone: 2000 Nogaro B5S4

  11. #11
    Veteran Member Four Rings obijohn22's Avatar
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    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    If you have the original coolant reservoir you may have an issue there. small cracks appear over time and when the system is pressurized, they leak. It could be leaking right down onto the exhaust mani and evaporating. I think you should pressure test the coolant system as Mholme said and definately check the afterrun pump area. I would assume that some mechanics that aren't familiar with the 2.7t would not even know it is there. Is there any smoke from the tailpipe? If you are filling it weekly, i vote leak, if you were burning that much it seems you would notice.
    "NIGHTMARE" Stage 3+ 2001.5 Brilliant Black S4. VAST sauce

    My shit goes like whoosh boom pshhh and like vroom and junk. So fast.

  12. #12
    Veteran Member Four Rings RolledMySTi's Avatar
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    Jul 06 2007
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    2001 S4 Sedan Laser Red
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    San Jose, CA

    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    How much is leaking? These cars lose a little coolant through the overflow in the hot months. Me and two other S4 owner were talking about this yesterday and all of us have a little coolant disappearing every week.
    01 Laser Red S4 Stage 3 | Vast Fueling | Clutchnet 6 Puck Disk with RS4 PP | APR Downpipes | Neuspeed Exhaust | SRM Side Mounts | ECS Pulley Kit | RS4 Airbox | UUC Short Shifter | ST Coilovers| Samcos | AWE DTS Bar | JHM Center Diff | 034 Track Motor Mounts + Street Trans Mounts |Apikol blue rear diff mount and bushings | Areomotive Fuel Pump | Hooked on Meth

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  13. #13
    Senior Member Three Rings
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    May 06 2009
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    01S4, looking for a second
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    indy

    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    The overflow amount should level off at a point if you stop adding more. Mine seems to have stopped.

  14. #14
    Veteran Member Four Rings obijohn22's Avatar
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    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    I haven't added to mine ever. and i can smell coolant on rare occasions. but the level never drops
    "NIGHTMARE" Stage 3+ 2001.5 Brilliant Black S4. VAST sauce

    My shit goes like whoosh boom pshhh and like vroom and junk. So fast.

  15. #15
    Veteran Member Three Rings
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    brooklyn, ny

    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    Quote Originally Posted by NY EURO S4 View Post
    well its my first car so i dont think i would notice any much differential. But it runs fine i guess, its not too its full potential because it needs o2 sensors, which i am going to get done soon.
    that is a nice car (when it works ) for a first car.... if u need a new mechanic, this is the place i go to. and they are only about 30 mins from you.. great guys, no bs...
    http://www.tyrolsport.com/

  16. #16
    Registered Member Four Rings ThirdStrike's Avatar
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    Nov 17 2006
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    b5S4, mk4GTi, 8pA3
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    N Las Vegas

    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    is there coolant in your oil?
    00110100011100100110100101101110011001110111001100 001101000010100000110100001010
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  17. #17
    Registered Member One Ring
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    2000 Audi S4
    Location
    Floral Park, NY

    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    Quote Originally Posted by saucys4 View Post
    my guess is that you're overfilling your coolant reservoir. the coolant level should rest at the "min" line on the expansion tank.
    i fill it to the max lol
    maybe that is the reason then that it keeps on running low...

  18. #18
    Registered Member One Ring
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    2000 Audi S4
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    Floral Park, NY

    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    Quote Originally Posted by RolledMySTi View Post
    How much is leaking? These cars lose a little coolant through the overflow in the hot months. Me and two other S4 owner were talking about this yesterday and all of us have a little coolant disappearing every week.
    there isnt a lot leaking at all.. i mean i have to basically refill it like at the end of every week..

  19. #19
    Registered Member One Ring
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    2000 Audi S4
    Location
    Floral Park, NY

    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    Quote Originally Posted by alexverve View Post
    that is a nice car (when it works ) for a first car.... if u need a new mechanic, this is the place i go to. and they are only about 30 mins from you.. great guys, no bs...
    http://www.tyrolsport.com/
    do they charge a shit load?

  20. #20
    Registered Member One Ring
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    2000 Audi S4
    Location
    Floral Park, NY

    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    I have another question...

    since it is only summer right now, is it okay if i put in water instead of actual antifreeze? and then in the winter, just start putting in regular antifreeze..

  21. #21
    Veteran Member Four Rings Mooseimage's Avatar
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    Feb 15 2008
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    2004 Audi Allroad
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    Sacramento, CA

    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    I've read about race cars running straight distilled water during the summer. You can probably too, or thin the mix out with a water/coolant ratio of 80/20. I'm currently running a 60/40 ratio since it's still hot out.
    GCC Rule #22 Enforcer
    marty was here: id stay away from the womb that gave birth to fail

    2004 Audi Allroad 2.7T Tip: track density motor mount, snub mount.

  22. #22
    Veteran Member Four Rings W1CK3D's Avatar
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    North 'burbs (Chicago)
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    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    Quote Originally Posted by NY EURO S4 View Post
    I have another question...

    since it is only summer right now, is it okay if i put in water instead of actual antifreeze? and then in the winter, just start putting in regular antifreeze..
    It's not bad to top it off with distilled water, but I would still try and have as close to a 50/50 mix as possible, but that's me
    Current: 2002 Nogaro B5S4
    Gone: 2006 Dolphin Grey B7S4
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  23. #23
    Veteran Member Four Rings KNaudi's Avatar
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    B5 S4, C6 S6
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    Chicago and IN
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    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    I just had a similiar problem and I used distilled water for about 2 weeks w/o issue. In summer months, it really doesn't matter too much. Winter is a different story entirely
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  24. #24
    Veteran Member Three Rings
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    brooklyn, ny

    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    Quote Originally Posted by NY EURO S4 View Post
    do they charge a shit load?
    depends. in any case, you live in NY - nothing is cheap. as long as u do not expect to pay labor with prices from Arizona or Georgia, it is ok. compairing to others in the area they are average. but they do good job, with warranty, they would not tell you do things you do not need, and they treat their regular customers even better. great bunch of guys, all into car racing (not drag), so they know what works and what does not.
    Last edited by alexverve; 08-13-2009 at 10:49 AM.

  25. #25
    Veteran Member Three Rings saucys4's Avatar
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    San Diego/SF Bay Area

    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    Quote Originally Posted by NY EURO S4 View Post
    i fill it to the max lol
    maybe that is the reason then that it keeps on running low...
    When I first purchased my car, I thought it was loosing coolant until I realized that it would never fall very far below the "min" line on the coolant expansion tank. "min" is what the minimum coolant level should be when the system is not under pressure. When your coolant heats up, it expands and the system becomes pressurized and the coolant level will rise near the "max" line on the tank. If there is too much coolant, excess will drain out of the coolant overflow hose located on the bottom of the tank.
    Arrogant Bastard

  26. #26
    Senior Member Three Rings kingofqueenz788's Avatar
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    audi s4 2000
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    NewYork, NewYork

    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    i would not put in just water because if u get the wrong miuxture and not the 50/50 and just forget about it you will have 1 not happy turbos, and 2 possibly a broken heater core if sitting in the cold winter with thease cars i figured out the hard way that everthing needs to be manufactures speck spend the lil extra money and get it done rite trust me ! thease cars are like high maintenance women!
    BUY >ME< help the s4 fund :-) 1997 vw jetta cleann!!!!http://forums.vwvortex.com/zeropost?cmd=fshow&id=811

  27. #27
    Senior Member Three Rings kingofqueenz788's Avatar
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    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    oh and i forgot to add under the intake manifold wheir the after run pump is their are hard pipes wheir coolant runs threw if the seals are worn or damaged youll see the coolant under the manifold it is not necesseserly the after run pump!
    BUY >ME< help the s4 fund :-) 1997 vw jetta cleann!!!!http://forums.vwvortex.com/zeropost?cmd=fshow&id=811

  28. #28
    Veteran Member Four Rings KNaudi's Avatar
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    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    Quote Originally Posted by kingofqueenz788 View Post
    i would not put in just water because if u get the wrong miuxture and not the 50/50 and just forget about it you will have 1 not happy turbos, and 2 possibly a broken heater core if sitting in the cold winter with thease cars i figured out the hard way that everthing needs to be manufactures speck spend the lil extra money and get it done rite trust me ! thease cars are like high maintenance women!
    dude, its august. its a temporary fix.
    My WTB List:
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    KNaudi's story

  29. #29
    Senior Member Three Rings
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    01S4, looking for a second
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    indy

    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    btw, has anyone used any of the other bosch inline pumps? or full aftermarket pumps? they are pretty cheap. for a more relaible pump possibily.

  30. #30
    Established Member Two Rings stevea6/z28's Avatar
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    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    Quote Originally Posted by obijohn22 View Post
    If you have the original coolant reservoir you may have an issue there. small cracks appear over time and when the system is pressurized, they leak. It could be leaking right down onto the exhaust mani and evaporating. I think you should pressure test the coolant system as Mholme said and definately check the afterrun pump area. I would assume that some mechanics that aren't familiar with the 2.7t would not even know it is there. Is there any smoke from the tailpipe? If you are filling it weekly, i vote leak, if you were burning that much it seems you would notice.
    x2

  31. #31
    Registered Member One Ring
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    Aug 09 2009
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    2000 Audi S4
    Location
    Floral Park, NY

    Re: HELPPPP!!!! Why does my AntiFreeze keep decreasing?!?!?

    hmm interesting :) - thanks for replies guys!

  32. #32
    Registered Member One Ring
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    Apr 01 2010
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    Location
    Floral Park,Ny

    Hello there...I too live in Floral Park and am experiancing the same problem...I was wondering if you new of a good/trustworthy mechanic? I'm new to the area.

    Thanks!

  33. #33
    Veteran Member Four Rings SurferD's Avatar
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    I have exactly the same problem. Every month or so my low coolant warning comes on. I fill it, no leaks anywhere and it does the same thing. I think the res tank's cracks are permeable.
    Formerly: 2007 S4 Avant 6MT brilliant black
    JHM parts: 93 octane tune, short shifter, lightweight crank pulley, ported intake manifold/spacers, 4:1 T3 center differential; FastIntentions downpipes/catback; Hotchkis-Sport sways; Apikol poly snub mount; 034 Motorsport zero-gap snub bracket; Apikol poly rear differential mount; dba brake rotors; Cupra R Front Lip; RS4 Black optic grille; Custom fog grilles; Aluminum mirror housings; Carbon fiber interior trim; TSW Nurburgring/Michelin Pilot SS



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