Eddie266

i need help figuring out where my audi is leaking. i keep having to refill the coolant every 7 weeks because it's slowly leaking, i posted some pictures of potential leaks. The car runs like a champ a/c works no check engine and temperature sensor is always in the middle it never overheats, but i know for a fact that i should not have to refill the coolant every month and a half . Iet me know if you have any suggestions on how to fix this and the parts that i need

Mbogosia

You probably have a crack in the reservoir that expands when it gets hot and leaks.

A4Audi4Fun

agreed - check for any areas that look like they have a powdery residue from coolant drying out due to engine heat.

John535is

also check the o ring on the blue cap. What can happen is the heat soak when the engine is first turned off actually causes the coolant to boil if the pressure is not right. Check for a leak out of the reseviour overflow 5 minutes after you turn the engine off. You might find it spits out a small amount. The caps with new o ring are pretty cheap.