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VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old February 2nd, 2006, 03:49   #1
Shamrockez
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Default Coolant Flush

Hello, me again lol. I had the water pump replaced on my 99 New Bug TDi when the belt was changed at 60k. Anyway, the coolant (blue) light had been flashing for a while, so a couple of weeks ago, me and my bf changed it. Since then the flashing has been 'better' but not gone completely, and sometimes the blue light comes on and stays on after the normal 'warming up' time. Anyway, when I changed the sensor, I bought some G12 coolant to replace any which was lost. Subsequently, some was lost during the change, so I mixed the coolant up and added a little bit. Only to find that the G12 was pink, and the coolant already in there, was yellowish!

What make is the yellow coolant? Is this not right for my engine? And do I need to remove it and replace it with G12?

Thanks,

*Lucy*
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Old February 2nd, 2006, 04:51   #2
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Ms. Lucy, the G12 coolant has such a remarkable service history that few are willing to experiment with other (lesser, inferior) products. I hope that makes sense.
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Old February 2nd, 2006, 05:11   #3
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Yes that makes sense. Do you think it's best to flush it out and replace with G12 then?
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Old February 2nd, 2006, 05:15   #4
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If it ain't pink it ain't right.
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Old February 2nd, 2006, 05:18   #5
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Lucy, it's best to flush - - these highly-evolved coolants don't like to be mixed with inferior products. Some poor folks have experienced severe sludging.

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Old February 2nd, 2006, 05:23   #6
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Quote:
Originally Posted by dieseldorf
Lucy, it's best to flush - - these highly-evolved coolants don't like to be mixed with inferior products. Some poor folks have experienced severed sludging.
And we know that has to be cut out.
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Old February 2nd, 2006, 05:25   #7
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Ha !!
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Old February 2nd, 2006, 08:14   #8
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additionally the owners manual is very clear not to mix G12 with anything else. The wording is quite strong and clear (something rather rare in the owners manual) just my $.02
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Old February 2nd, 2006, 09:08   #9
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Ok, thanks guys Next question - how do I flush it out? And where do I drain it from? I don't suppose there's a 'how to' anywhere?

I'm trying to do as much stuff as I can to this car myself.... cos as this post illustrates, you can't trust other people to get it right

*Lucy*
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Old February 2nd, 2006, 09:13   #10
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Lucy, have you or have you not already mixed the two coolants?
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Old February 2nd, 2006, 09:25   #11
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there's about 50mm (mixed) G12 in with the other stuff - cos it was low
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Old February 2nd, 2006, 09:50   #12
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I wished you had topped up with water and then determined what the main (??) dealer used when the TB work had been completed.

The coolant you describe, light yellow, is typical of the product used by other Euro mfrs today. We call it G-05 in the USA. If you hadn't blended, I would have suggested sticking with it. Since you have blended, I think you need to drain all and get back to just ONE type of coolant.


Hopefully someone else can help with the appropriate drain guidance.
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Old February 2nd, 2006, 09:56   #13
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Sounds like it would be best to flush it then. Thanks
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Old February 2nd, 2006, 09:59   #14
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Flush it REALLY throughly. There is a drain on the driver's side of the radiator... on the bottom. I believe you twist and pull to open it? I don't know for certian. But rince things like three times. Any ammount of other coolant can react with G12 and cause problems

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Old February 2nd, 2006, 10:27   #15
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what do I use to flush it? Tap water? Or G12, spin the engine, drain, more G12, spin the engine, drain etc?
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