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    Thread: coolant leak problem

    1. Member kurin's Avatar
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      02-23-2010 12:30 AM #1
      i thought the problem had been solved last August at a local car repair shop, where I threw about five hundred dollars for a lifetime water pump. The previous pump was tested to be leaking. and they did a coolant system flush, fill in new G12 in.
      Yesterday I opened hood to find the coolant was on "MIN" level again. In a week or two the coolant warning indicator will be on. Should I go to buy some G12 to replete ?

    2. 02-23-2010 01:43 AM #2
      Quote, originally posted by kurin »
      i thought the problem had been solved last August at a local car repair shop, where I threw about five hundred dollars for a lifetime water pump. The previous pump was tested to be leaking. and they did a coolant system flush, fill in new G12 in.
      Yesterday I opened hood to find the coolant was on "MIN" level again. In a week or two the coolant warning indicator will be on. Should I go to buy some G12 to replete ?


      well for starters was the car cold when you checked the fluid level?? because it should sit at the min line when cold and around the max line when hot. Also how cold is it there? G12 contracts a lot when cold so it might be due to temperature.

      If you are concerned go to the dealer and buy some g12 and keep a bottle of de-ioned (de-mineralized should be the same thing) water in your car to top it up if needed. Do not use tap water as tap water contains dissolved ions which allow for conduction (causes corrosion in cooling system), G12 does contain anti-corrosion chemicals so topping it up with tap water might not be that bad but I wouldn't want to do that.


    3. Member kurin's Avatar
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      02-23-2010 02:17 AM #3
      thanks a bunch!
      the level is just much lower definitely than last time's check when the coolant just got filled. it's been six months, so i thought it's a slow leakage.
      will check for it more .

    4. 02-23-2010 02:21 AM #4
      Quote, originally posted by kurin »
      thanks a bunch!
      the level is just much lower definitely than last time's check when the coolant just got filled. it's been six months, so i thought it's a slow leakage.
      will check for it more .

      also from what has been explained to me it does take a little while for the air to completely work out of the system.


    5. Member kurin's Avatar
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      02-23-2010 05:08 PM #5
      I checked it just now, three minutes after stopping engine.
      Unfortunately the level is now 1cm below the minimum level.. I'm going to buy g12 to top up. and possibly study the reason for the leakage..
      but how can i make sure the final concentration is between 0.4 and 0.6?

    6. Senior Member bluefox280's Avatar
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      02-23-2010 10:33 PM #6
      Quote, originally posted by kurin »
      I'm going to buy g12 to top up. and possibly study the reason for the leakage...

      A compression test both on the coolant system, and the engine would give you a clear indication where it's coming from.

      Quote, originally posted by kurin »
      but how can i make sure the final concentration is between 0.4 and 0.6?

      Since you're only topping off, it's not really a big deal.
      However you can pre-mix your G12 / distilled water combo and then add to the system.
      But since an iniment repair is needed, save the G12 and use distilled water with some G12 (for cold weather).

      - Erik

      Pattern Draft Imaging.com - "...Where Engineering Discipline and Photography Merge as One..."

    7. Member kurin's Avatar
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      02-23-2010 11:24 PM #7
      thanks.
      they determined it was the water pump by means of pressure test half a year ago. and a new water pump cost me five hundred...
      if it only needs to add one dose of g12 every year, it's not too bad...

    8. Member kurin's Avatar
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      02-25-2010 08:47 PM #8
      what's a good device for adding coolant?
      I used a kitchen measure cup (not for kitchen use anymore), but got a little spilt outside of the coolant expansion container. Not sure what would be affected..


    9. Member kurin's Avatar
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      03-13-2010 05:36 PM #9
      It's really a pain now.
      I topped off the coolant on 2/25, yet today 3/13 i found the coolant is again 1cm lower than "min" level, just like before it got topped off only two weeks ago.
      how come the car kept going without coolant issues for half a year since the car reapir shop replaced the water pump last August, but the coolant are actually leaking so fast?
      but I guess if I don't top it off, it would from now on become slow in leaking rate... maybe there's a "extra" pressure generated if coolant is added. The pressure disappears somehow once the coolant is leaking to the current level.
      what should I do to find out where it is leaking?

    10. Member limastock's Avatar
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      03-13-2010 05:40 PM #10
      1) I guess you have a leak again

      2) How the hell did you manage to pay 500$ for a water pump, they cost like 70$

      3) Your english is atrocious

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    11. Member kurin's Avatar
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      03-13-2010 05:46 PM #11
      apparently it's a leakage. and not slow.
      you don't believe the cost of water pump changing? I still have the receipt..
      what do I do? top it off now?

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      03-13-2010 05:46 PM #12
      There are multiple problem areas on these cars for coolant leaks.. I've seen it 1000 times.. fix one leak and another comes. And the customer ALWAYS thinks its from the part that was just replaced.

    13. Member kurin's Avatar
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      03-13-2010 05:50 PM #13
      1000 times.. you must be a mechanic.
      can my case fall into the set of your cases?

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      03-13-2010 06:03 PM #14
      any signs of it leaking into the oil? any drips under the car after a while? can you smell coolant burning off?
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    15. Member kurin's Avatar
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      03-13-2010 06:20 PM #15
      i didn't ever notice drips under the car.
      a friend told me if the smell of coolant leakage is sweet. but i didn't smell it yet.
      what would be signs of coolant leaking into oil?

    16. Member limastock's Avatar
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      03-13-2010 06:23 PM #16
      If it was leaking into your oil you would have blue smoke coming from your exhaust.
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    17. Member kurin's Avatar
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      03-13-2010 06:30 PM #17
      ok, I'll check it. but I remember the exhaust smoke is white in winter.

    18. Member limastock's Avatar
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      03-13-2010 06:36 PM #18
      Thats probably just because its cold man...
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    19. Member kurin's Avatar
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      03-13-2010 08:10 PM #19
      i see. hope the coolant is not entering cylinder.
      Can someone post a cooling system pressure test d-i-y here?
      don't know if this test has some destructive effect?
      Thanks a lot!

    20. Member NumberOne 2nd2none's Avatar
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      03-14-2010 01:58 AM #20
      Yea GTINC I was about to say... Not to mention coolant leaking into your oil is ONLY indicated by a milky color in the oil mostly seen from dipstick.
      Also your oil condition cannot be indicated by your exhaust AT ALL unless oil is burning in your cylinders which would indicate a leaking/blown head gasket.

      No need for a coolant system pressure test DIY. You simply buy the tool that comes with many different adapters and screw in the correct adapter into top of coolant overflow tank. If your system wasnt holding pressure tho you would most likely be over heating... If you still want to run the test just warm up to normal operating temp. & observe gauge. Pressure should hold in the system and MAX testing pressure you can apply is 18psi. in 1.8T - If the 18psi you apply to the system is not holding you have a leak somewhere. A fast drop tells you your head gasket is ****ed if you dont have any external leaks... External leaks should be the FIRST thing you check. ALSO check your timing belt if you suspect water pump leakage again... The timing belt will have coolant on it which causes it to break really fast so check check & double check. If you think coolant is getting into your cylinders than check your spark plugs!!

      ANOTHER VOLKSWAGEN DOWN... F&%K

    21. Member kurin's Avatar
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      03-14-2010 12:21 PM #21
      thanks, that's a lot of info to me.
      so first thing is to check external from under the engine bay right? I'll do it soon.
      then how to check sparks plugs?
      thanks.

    22. Member NumberOne 2nd2none's Avatar
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      03-15-2010 01:07 AM #22
      Yea, look all around the engine bay for any sign of coolant...
      You can easily check plugs by removing your engine cover/coil packs. Use a spark plug socket + extension and take out the spark plugs. See if they are fouled out/wet
      ANOTHER VOLKSWAGEN DOWN... F&%K

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