So the rada has been going very well lately, but I was on the corner of bell and sydney road the other day waiting in traffic and it started vibrating weirdly, and then it went away. Ever since it's been doing it fairly regularly, seems to happen a lot more on hot days and you can sometimes stop it by turning the AC off.

To sum up:
-Happens more with AC on, but not a requirement
-Happens without AC on, but not as often
-Happens more on hot days
-Can only notice it at idle
-After turning the car off it continues making the sound for a second or two. That is: Pull up> vibration/noise appears> put car in park> handbrake on> turn engine off> engine turns off> 1-2 seconds> noise stops

So far I have:
- Replaced acc+power steering belt
- Did two services
- Visually checked fans, pulleys. No missing bits.

Any ideas?

Manually run up the fans mate, have had this before and was a dodgy fan, looks ok but the motor is causing the issue

Not a bad idea, will go give it a shot.

This sounds similar to an odd vibration / shake I occasionally get in my Verada.

Please do keep us updated if this solves your problem.

Spot on mate, passenger side fan.

You got one lying around there?

Just looks like the 4 bolts to replace?

Thought I should give more info.

The drivers side fan turns pretty freely, the passenger side is a bit harder to turn. When the engine cuts the fans continue spinning, the passenger side fan continues making noise for a while.

Have them here