Hello all.

So just got all my coolant lines replaced after complete failure on my 2011 A5 with 84k miles. Once I got my car back I noticed a fast chirping noise which is particularly loud when cold, then dies off almost completely when engine is warm.

I started by replacing my tensioner pulley and fielder pulley as well as the belt. Turned car in and it’s still there. Almost sounds like it is coming from the rear area of the engine. Any thoughts on what may be making this noise? PCV?

FYI- Audi replaced my timing chain etc around 10-15k miles ago.

I’ll try to post a video later.

Thanks in advance!