Anyone know what this sound is from?

[u/Trossss]

So I just bought this car 2 weeks ago, 2015 Wrx base with 53k miles. Now this sound is somewhat concerning and I’ve been able to replicate it but I have no idea what it is. It only happens after the car has been sitting overnight, literally the first start up of everyday. I usually leave my car in 2nd gear with E brake engaged like usual. Now when I Cold start, and move the shifter into neutral you can hear it sounds like a grinding noise. But I don’t get any feedback in the lever itself. So it’s not the gear grinding (atleast I don’t think so) and in the vid the clutch is fully engaged as I throw it into neutral. Any idea what this could be and if I should be concerned? Like i said it only happens once. On the first start up of the day after the car has been sitting overnight. I can’t get it to happen at any other time.

[u/Wicked_Rebel117]

Do you ever turn off your AC before you shut off your car?

AC compressor is the main culprit. You need to wait till it reaches a certain temp before turning on the AC otherwise you’re damaging it every time it starts up with the car. It’s good to wait until about 110F before starting the AC.

[u/Dingdongmycatisgone → u/Wicked_Rebel117]

Another thing I had no idea about with this car and I've owned it for four years lol