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Coolant leak somewhere. help ! - 04 A4 1.8T

Old 09-19-2012, 01:57 PM
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Default Coolant leak somewhere. help ! - 04 A4 1.8T

My coolant in my Audi keeps depleting in a few months, which is definitely not normal. I took it to a local mechanic and they did a pressure test and said they couldn't detect any leaks.

I need to fix this ! I don't want it to become a bigger problem then it needs to be. And I don't want to go to a stealership.

Any suggestions for good and fair local shops around Toronto / Scarborough to look into this. Or has anyone had a similar problem ??


Thanks in advance.
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Old 09-19-2012, 04:42 PM
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Default Re: Coolant leak somewhere. help ! - 04 A4 1.8T

Leaky coolant container - on my 2005 A4 3.0 there was a hairline crack on the underside. Should be able to see evidence of leaking though - look for white powder around the engine bay; I noticed seepage down in the water pump area as well on mine.
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Old 09-21-2012, 09:47 PM
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Default Re: Coolant leak somewhere. help ! - 04 A4 1.8T

What side is the leak on? if its on the passanger side leaking onto the exhaust it could be your coolant flange or a hose connecting to it.
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Old 09-24-2012, 09:47 AM
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Default Re: Coolant leak somewhere. help ! - 04 A4 1.8T

I am having the same problem... It is on the passenger side but mine leaks out at least twice a day. It seems like it is right behine the head. Any suggestions?
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Old 09-25-2012, 12:11 PM
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Default Re: Coolant leak somewhere. help ! - 04 A4 1.8T

Could be the pressure flange/valve (I think that's what it's called). It's a plastic coupling mounted on the rear of the block. The gasket tends to ware after time or the coupling could have just cracked. It's not a huge issue and is somewhat costly to fix. It will cost a bit because the coolant will need to be drained before the repair can be done. Unless you are topping it up every day, I would wait till it gets worse if that is an option. I know mine leaks, and I only see it on my driveway once a month.
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Old 09-25-2012, 02:46 PM
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Default Re: Coolant leak somewhere. help ! - 04 A4 1.8T

Thanks. I took it to a mechanic and he told me the leak was coming from the head gasket. Not good. I want to get a second opinion so I am going to take it to another guy tomorrow.
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Old 10-29-2012, 08:05 PM
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Default Re: Coolant leak somewhere. help ! - 04 A4 1.8T

Did you ever get a second opinion? I would think its the coolant flange at the back of the motor which is leaking.
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Old 10-30-2012, 12:18 PM
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Default Re: Coolant leak somewhere. help ! - 04 A4 1.8T

If you can't see the leak anywhere, another place to check in that back of engine area is the j-plug. It's a little plastic bit (shaped like a J...) that hide under the thermostat assembly. They commonly crack and slowly seep coolant at the rate you describe. The part itself is pretty cheap but I think there is a fair bit of disassembly involved if I remember correctly.
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Old 11-06-2012, 06:33 PM
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Default Re: Coolant leak somewhere. help ! - 04 A4 1.8T

X2 on the coolant flange!
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Old 02-27-2013, 04:39 PM
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Default Re: Coolant leak somewhere. help ! - 04 A4 1.8T

My a4 cab 1.8 has this flange leaking and is in local vw/audi garage being fixed , i will post tomorrow with cost etc
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