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Coolant leak from above oil filter housing?


Expatty
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Hello all,

I recently developed a coolant leak on my A4 B6 1.8t quattro. I first assumed it was the thermostat so I replaced it. Upon replacing it it seems I still had the leak. I tore everything out of the way in the engine bay again only to find this small hose has deteriorated. It goes from above the oil filter housing into the coolant system? I cant find the hose anywhere online, maybe I'm not searching the correct words. Can anyone help me?

 

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Thanks for the reply mate, I found an engine bay drawing and found the culprit. Its a crankcase oil breather hose. got the part number and ordered!

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ok, its just when you mentioned coolant leak and coolant etc , its just that this hose does not have any water in it, it has, Air. . So I didn't quite know how to tell you this. Anyway good to know you sussed it out ..  So point is you will still have a coolant leak to find because replacing this pipe will not fix the coolant leak . If you dust the cooling hoses with talcum powder , this helps to identify the origin of the leak as it leaves a mark in the powder... Jasonj

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No you are right mate there isn't any coolant in that line, upon doing some digging I've realised thats what that was. Thanks for the assist and the tips mate I really appreciate it! I think I may not have cleaned the face of the block up enough when seating the thermostat and it's possibly leaking from the seal there. I'll keep looking after the parts come!

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