A3 1.8t agu coolant problem

[gregor571]

Hello!

Recently I noticed that the Y -shaped pipe near the expansion bottle was cracket and leaking.
Then the coolant started to boil in the expansion tank after driving (temp gauge still at 90).
The Fan kick in as usualy. Car performance is normal.

So, could be the leaking Y-pipe the cause of the boiling in the ex. bottle?
Can be low coolant level the cause of boiling or maybe something else?

Thank you all for answers!!!!

 

[ZakG]

Hello!

Recently I noticed that the Y -shaped pipe near the expansion bottle was cracket and leaking.
Then the coolant started to boil in the expansion tank after driving (temp gauge still at 90).
The Fan kick in as usualy. Car performance is normal.

So, could be the leaking Y-pipe the cause of the boiling in the ex. bottle?
Can be low coolant level the cause of boiling or maybe something else?

Thank you all for answers!!!!

Well, what was the issue? I have the same problem.

 

[Zans]

I suggest you replace your Y pipe and see if the coolant stops boiling. Since it's hard to fetch an original one I suggest you get a kit that replaces most plastic junctions with aluminum ones. https://www.ebay.com/itm/322937217118