A8 / S8 (D4 Platform) Discussion Discussion Forum for the D4 Audi A8 Produced from 2010-2017 Audi S8 produced from 2012-2017

Coolant leak fix?

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Old Jan 22, 2019 | 09:53 AM
  #1  
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Default Coolant leak fix?

Found a leak in my 2015 audi. Is this a simple fix or should I take it to dealership?

Looks like coolant tank is leaking... any idea about cost and how can I fix it?

I think this leak started soon as it getting cold.. around -10


Coolant leak
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Old Jan 23, 2019 | 04:51 AM
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There are 4 engines available in the 2015 model. It would be helpful for you to list your particular one. You could put it in your signature.
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Old Jan 23, 2019 | 04:59 AM
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2015 audi a8L 4.0T
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Old Jan 23, 2019 | 04:26 PM
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If the coolant is too full it will leak out around the coolant bottle, I had this exact issue. I would just keep an eye on it, if it keeps getting lower then you need to get it fixed.
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Old Jan 14, 2020 | 05:06 PM
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Curious if the tank needed to be replaced - I have a similar leak or if it was something else?

Thanks in advance.
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Old Jan 14, 2020 | 06:13 PM
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The coolant tank is generally not a terribly expensive or difficult part to replace on most cars. My D3 was not a difficult car to change it on, and if memory serves me, the D4 doesn't look any harder to do. The most annoying part is disconnecting and draining it without making too much of a mess. Be aware, the tank has this weird design of a filler on it such that there is a gap that allows fluid through the middle to drain out the bottom, it's hard to explain. I think it's so that if you open it hot, the fluid has a place to go other than spraying you with coolant. The point is, if you add coolant but get any around the lip and not in the reservoir, it runs out the bottom of the tank to the ground, not down the side of the tank.
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Old Jan 30, 2021 | 10:24 AM
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Originally Posted by Jack88
The coolant tank is generally not a terribly expensive or difficult part to replace on most cars. My D3 was not a difficult car to change it on, and if memory serves me, the D4 doesn't look any harder to do. The most annoying part is disconnecting and draining it without making too much of a mess. Be aware, the tank has this weird design of a filler on it such that there is a gap that allows fluid through the middle to drain out the bottom, it's hard to explain. I think it's so that if you open it hot, the fluid has a place to go other than spraying you with coolant. The point is, if you add coolant but get any around the lip and not in the reservoir, it runs out the bottom of the tank to the ground, not down the side of the tank.
Great info
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Old Feb 8, 2024 | 01:48 PM
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I'm sorry for ignorance, but can anyone tell me if it's okay to put Bars leak - stop leak into the actual coolant tank or it only can go into radiator? The coolant is leaking in audi a4 and I need to have a temporary solution. The auto shop said that thermostat house needs to be replaced and they want $2000.. I need temporary solution and not to damage the vehicle either. thanks
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Old Feb 8, 2024 | 02:12 PM
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Originally Posted by bark
I'm sorry for ignorance, but can anyone tell me if it's okay to put Bars leak - stop leak into the actual coolant tank or it only can go into radiator? The coolant is leaking in audi a4 and I need to have a temporary solution. The auto shop said that thermostat house needs to be replaced and they want $2000.. I need temporary solution and not to damage the vehicle either. thanks
Please god don't do that. It will seal it sure but you will have so many issues if you try that, for it to NOT gum up everything you need to totally remove ALL coolant. If you leave coolant in it will ruin everything
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