pkalltheway2000

My Audi Q7 just developed this weird high pitched whistling noise coming from the engine bay when the car is in 'idle' or 'driving' mode. Car has about 47000kms only.

Does anyone know what this noise is? PCV Valve, Belt Tensioner, Oil Separator...etc.

I've reached out to my service advisors but have not heard back. This sounds pretty serious and I am almost feeling embarrassed to be driving the car out.

I also heard a weird 'flapping' sound like something is opening and closing.

This high pitched could be annoying, please turn down volume when watching.

ecbc1

Sounds like the PCV value, but yours is really high pitched

pkalltheway2000

It's very high pitched as if my car was 'singing'. The whistling noise would only come out when the car is idling (park) and or 'cruising'. If I gas it, then the whistling noise would go away. It's like the noise of boiling water through a kettle.

petery129

Sounds like my car back in November, bad pcv valve. I ended up replacing pcv valve, thermostat, and water pump, about $2200 worth.

pkalltheway2000

Yap you are right. It looks to be the same. I tried to take out the engine oil cap while the engine was running but it was vacuum sealed pretty tight. Needed to pull really hard to get it to open.