I have the answer to you question!!!

Yes the squeeking drove me insane!
Sounded like it was behind the back of the center dash

My mate said he could here it outside the car
It sounded like a stupid bird aspecially if you accelerate and de-accelerate quckly or jerk car .

I found where the source of the problem was when i was pulling my gearbox out.

If you take off you top mount intercooler you will see a support bar from your engine to firewall. There is a rubber mount on each end thats squeeks when it moves as the mounts move.

Thats where the noise is coming from. Sound is directly behind heater unit/dash


Sorry but i dont know how to solve it. A little spray of lube there on each end of rubber bush maybe?