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  1. #1
    Active Member Two Rings a4b7-sline's Avatar
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    BWT 2.0TFSI Coolant

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    I did some digging around and couldnít find much.
    I bought my A4 from a private owner. The previous owner had taken the car to shops for service/repairs, so Iím assuming a garage did this. Long story short, my car has green coolant when I see most people have red coolant in their A4.
    My question is if I will run into any problems running on green coolant? About 2 months ago my water pump did seize which destroyed my motor but I donít think it was related.
    Thank you


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  2. #2
    Established Member Two Rings bwdysart's Avatar
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    I would probably flush it out and use the right stuff. G13 coolant is around $10/L found in pure 1.5L. Probably 2 but 3 just to be safe bottles of g13 is 4.5L for $45, then a bunch of distilled water from your grocery store should be less than $1/gallon. Thatís all youíll need to do a flush. https://m.youtube.com/watch?v=s--5ft5YiHg
    Hereís a video I really like on how to do a generic coolant flush.


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  3. #3
    Veteran Member Four Rings Audibot's Avatar
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    The biggest problem with green coolant is that if it meets G12/G13 (the pink stuff), it forms this weird sludge and turns a brownish color. That sludge is nasty and tends to block things up, such as the heater core. My C5 had this issue when I bought it. Most disgusting coolant I've ever seen.

    I recommend getting it completely flushed out (heater core too) and replaced with G12 or G13.
    2016 A6 TDI Prestige - S-Line, Black Optics, Driver Assistance, HUD, LED Headlights, Cold Weather, Warm Weather
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  4. #4
    Active Member Two Rings a4b7-sline's Avatar
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    Quote Originally Posted by Audibot View Post
    The biggest problem with green coolant is that if it meets G12/G13 (the pink stuff), it forms this weird sludge and turns a brownish color. That sludge is nasty and tends to block things up, such as the heater core. My C5 had this issue when I bought it. Most disgusting coolant I've ever seen.

    I recommend getting it completely flushed out (heater core too) and replaced with G12 or G13.
    I had flushed it and replaced all the coolant when I rebuilt the engine last month, but I just started to notice others using the red. No sludge found, but listening to others I should probably do a flush and replace w the red


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  5. #5
    Active Member Two Rings a4b7-sline's Avatar
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    Quote Originally Posted by bwdysart View Post
    I would probably flush it out and use the right stuff. G13 coolant is around $10/L found in pure 1.5L. Probably 2 but 3 just to be safe bottles of g13 is 4.5L for $45, then a bunch of distilled water from your grocery store should be less than $1/gallon. Thatís all youíll need to do a flush. https://m.youtube.com/watch?v=s--5ft5YiHg
    Hereís a video I really like on how to do a generic coolant flush.


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    Thatís what I thought, but wasnít sure if it was fine to run green and didnít wanna waste money and time, but Iíll definitely do it. Thank you for the video/input


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    2008 Audi A4 Sline 2.0t Quattro 6spd

  6. #6
    Account Terminated Two Rings
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    tell me you didnt use g13 when you did the engine swap? it says it right on the cap! KID

    Quote Originally Posted by a4b7-sline View Post
    I had flushed it and replaced all the coolant when I rebuilt the engine last month, but I just started to notice others using the red. No sludge found, but listening to others I should probably do a flush and replace w the red


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  7. #7
    Account Terminated Two Rings
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    idiotic. almost as stupid as me driving with low oil pressure when i knew i was suppose to pull over and tow to the nearest dealership...

    Quote Originally Posted by a4b7-sline View Post
    Thatís what I thought, but wasnít sure if it was fine to run green and didnít wanna waste money and time, but Iíll definitely do it. Thank you for the video/input


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  8. #8
    Veteran Member Four Rings Jay-Bee's Avatar
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    Quote Originally Posted by joepickems View Post
    idiotic. almost as stupid as me driving with low oil pressure when i knew i was suppose to pull over and tow to the nearest dealership...
    Nah Driving with no oil pressure is way more retarded than driving with the wrong coolant.

    If it's all green it's gonna work fine, the problem comes when mixing them. It says G12 on the coolant tank not G13.
    2008 Audi A4 Avant 2.0T
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  9. #9
    Active Member Two Rings a4b7-sline's Avatar
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    Quote Originally Posted by Jay-Bee View Post
    Nah Driving with no oil pressure is way more retarded than driving with the wrong coolant.

    If it's all green it's gonna work fine, the problem comes when mixing them. It says G12 on the coolant tank not G13.
    Yeah itís all scratched off where it says G12. I could only make out the G, so I just put G13 in since thatís what it had to begin with when I got it.


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  10. #10
    Account Terminated Two Rings
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    green coolant is not G13 so why would it be fine? i would not risk anything but G13 and isnt G12 discountinued from audi? i think i rememebr dealership saying they only carry G13 now.

    (driving with low oil pressure not a good idea. take it from me)


    Quote Originally Posted by Jay-Bee View Post
    Nah Driving with no oil pressure is way more retarded than driving with the wrong coolant.

    If it's all green it's gonna work fine, the problem comes when mixing them. It says G12 on the coolant tank not G13.

  11. #11
    Veteran Member Four Rings Avant4me's Avatar
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    I have run prestone any make any model for years..my car has been green for at least 5 years and absolutely zero problems. Color doesn't matter... what it actually is and what the chemicals are compatible with is what's important
    ~2007 DTM A4 S-Line Avant, 6MT, Stasis cat back, RAI downpipe, JHM Stage2 93, JHM HPFP, HFC, APR snub mount, 034M SD Motor mounts, RS4 RSB, VMR 708 19x8.5 ET35 245/35/19, B5 perches, NEUSPEED sport springs ~

  12. #12
    Veteran Member Four Rings Charles.waite's Avatar
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    Iíd only use G12 or G13 compatible coolant. Pentofrost E is the non-Audi brand thatís easiest to find.

    Thereís zero reason to not use the proper coolant. Zero.
    -CP
    2008 Brilliant Black Unicorn (2.0t S-Line Ti 6MT Avant)
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  13. #13
    Active Member One Ring
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    New to the forum...

    Just picked a up an 07 A4 Avant. Right out of the gate I had to replace the thermostat which was stuck open (low temp during morning freeway runs was the indicator). Not too bad of a job but I'm glad I tackled it as soon as I noticed it because the system was filled with only water! I used Zerex G40 50/50 after doing a full drain so I'm happy now. G40 meets current specs but you're supposed to do a flush and fill if you're going from old G12 to the newer stuff to get the proper protection. With all the hoses and plastic manifold parts that are exposed to coolant you want to make sure you use the proper coolant. Stuff with high silicates (old school green) can abrade plastic parts and seals as I understand it.

  14. #14
    Account Terminated Two Rings
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    low temp, do you mean your gauge was showing low when it should have been in the middle during drive on highway? i was wondering if my theromostat is stuck open because i have HOT air coming thru the vents into my cabin. its like i have the heat turned on in the car but i dont i have it switched off. only way to stop the heat from coming into the cabin is to turn on the AC. wondering how to fix this. b7wannabe said recirculation door is stuck open but not sure if that is related to my the HOT air coming thru the vents. car also makes loud buzz sound during startup and random "burps"when shut off

    Quote Originally Posted by ksw_92 View Post
    New to the forum...

    Just picked a up an 07 A4 Avant. Right out of the gate I had to replace the thermostat which was stuck open (low temp during morning freeway runs was the indicator). Not too bad of a job but I'm glad I tackled it as soon as I noticed it because the system was filled with only water! I used Zerex G40 50/50 after doing a full drain so I'm happy now. G40 meets current specs but you're supposed to do a flush and fill if you're going from old G12 to the newer stuff to get the proper protection. With all the hoses and plastic manifold parts that are exposed to coolant you want to make sure you use the proper coolant. Stuff with high silicates (old school green) can abrade plastic parts and seals as I understand it.

  15. #15
    Senior Member Four Rings tloft4's Avatar
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    Quote Originally Posted by Charles.waite View Post
    Iíd only use G12 or G13 compatible coolant. Pentofrost E is the non-Audi brand thatís easiest to find.

    Thereís zero reason to not use the proper coolant. Zero.
    agreed.

    luckily my gf has a semi hookup at a local dealer/shop (she doesnt press it as hard as she should[when her relatives own it]) ended up getting a flush/g13 fill for free but imagine my annoyance when she needs to refill green stuff and pays equal $$ for "premixed" coolant from a store.

    "no this is better, its pre mixed!"... they mix it with water.. "but its pre mixed!!" with water..... you paid the same price for half as much. "but now i dont need to add water..."

  16. #16
    Veteran Member Four Rings Charles.waite's Avatar
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    Hahaha. The struggle is real.
    -CP
    2008 Brilliant Black Unicorn (2.0t S-Line Ti 6MT Avant)
    2012 Q5 2.0t - Stock Mommy Missile with new timing chains
    Former USP CLUB MEMBER #136
    2004 A4 1.8TQ 6MT USP - APR Stage 1+ - FSI Coils - BKR7EIX-11 - B6S4 Front + B7A4 Rear Brakes - 034 Street Trans Mount
    SOLD -- 2006 A4 2.0TQ Avant Tiptronic

  17. #17
    Active Member One Ring
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    Yes, my temp gauge never got to the middle of the range until I'd been sitting in stop-n-go traffic for a bit. With the t-stat replaced it now warms up in a few minutes and stays glued to the middle marker regardless of what's going on, drive-wise.

    I suspect your problem is in your HVAC unit. I don't know much about the internals of the Audi heater box to help, but from owning Saab 9-5s and their dual-zone system I assume that you have some issues with the temp-blend servos and/or flaps. I thought the Audi HVAC systems were pretty robust? The 9-5's weren't, at least in the early years.

  18. #18
    Veteran Member Four Rings Charles.waite's Avatar
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    Yea the thermostats in the b7s are a weak point. Iíve had to replace them in both my b7s before 65k miles. They definitely should last longer than that.
    -CP
    2008 Brilliant Black Unicorn (2.0t S-Line Ti 6MT Avant)
    2012 Q5 2.0t - Stock Mommy Missile with new timing chains
    Former USP CLUB MEMBER #136
    2004 A4 1.8TQ 6MT USP - APR Stage 1+ - FSI Coils - BKR7EIX-11 - B6S4 Front + B7A4 Rear Brakes - 034 Street Trans Mount
    SOLD -- 2006 A4 2.0TQ Avant Tiptronic

  19. #19
    Active Member Two Rings rbjeepthing's Avatar
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    I need to change my oil filter housing and i'm having a difficult time finding the G12 coolant in orange/pink.

    I can easily get:
    Fuchs Coolant
    ACL Part #: 1573B | Ref Part #: G013A8J1G
    VW G13 COOLANT
    NEW SPEC FOR AUDI-VW (TL 774J)
    Violet in color - 5L JUG
    ALSO AVAILABLE IN 1L/1573A,205L/1573D
    THIS IS THE NEW PREMIUM VW COOLANT
    CAN BE MIXED WITH G11/12/12+/12++

    Can I actually mix this or do I have to do a complete flush and fill?

  20. #20
    Senior Member Four Rings tloft4's Avatar
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    Quote Originally Posted by rbjeepthing View Post
    I need to change my oil filter housing and i'm having a difficult time finding the G12 coolant in orange/pink.

    I can easily get:
    Fuchs Coolant
    ACL Part #: 1573B | Ref Part #: G013A8J1G
    VW G13 COOLANT
    NEW SPEC FOR AUDI-VW (TL 774J)
    Violet in color - 5L JUG
    ALSO AVAILABLE IN 1L/1573A,205L/1573D
    THIS IS THE NEW PREMIUM VW COOLANT
    CAN BE MIXED WITH G11/12/12+/12++

    Can I actually mix this or do I have to do a complete flush and fill?
    you answered yourself

  21. #21
    Active Member Two Rings rbjeepthing's Avatar
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    08 A4 Avant, 95 YJ, 01 Duramax, 18 JK
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    Quote Originally Posted by tloft4 View Post
    you answered yourself
    Expected someone to say that, just always second guess myself and sometimes others...lol

  22. #22
    Veteran Member Four Rings nizmosx's Avatar
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    Guys, just so you know, G12 is DISCONTINUED by audi and Superceeded by G13. This is the part number we all now need to run even though your reservoir says G12.

    G013A8J1G

    I also talked to several techs at the Audi dealership and mentioned my car has G12 in it and needs to be topped off. I asked if i need to do a full flush of the G12 before putting in G13 and he said NO. Go ahead and top off with G13. Its fine to mix and thats exactly what i did.

  23. #23
    Veteran Member Four Rings Charles.waite's Avatar
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    Apparently g13 has less toxic shit in it or something. Either way, yea itís the new coolant hotness. Might as well get that as itís fully compatible with cars that specified g12.
    -CP
    2008 Brilliant Black Unicorn (2.0t S-Line Ti 6MT Avant)
    2012 Q5 2.0t - Stock Mommy Missile with new timing chains
    Former USP CLUB MEMBER #136
    2004 A4 1.8TQ 6MT USP - APR Stage 1+ - FSI Coils - BKR7EIX-11 - B6S4 Front + B7A4 Rear Brakes - 034 Street Trans Mount
    SOLD -- 2006 A4 2.0TQ Avant Tiptronic

  24. #24
    Active Member Two Rings a4b7-sline's Avatar
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    Quote Originally Posted by a4b7-sline View Post
    Yeah itís all scratched off where it says G12. I could only make out the G, so I just put G13 in since thatís what it had to begin with when I got it.


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    So I was rereading these and realized I wrote g13, I did not mean g13 lol. I meant green coolant but typed g13 for some reason or another. My bad


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