PROBLEM SOLVED !!!
after many sleepless nights of thinking, yesterday I asked my friend to drive the car while i am trying to pinpoint the squeak, it turns out it comes from a seal in the heater, where the cooling lines come out of the fire wall.
All it takes is a little bit of Lubrication. i used a syringe with LM lube that doesn't attack rubber and plastic.
Made a litle video on youtube for you.
I Know that it seems strange but it was the thing that made the horrible squeak that seemed to come from behind the dash.
Hope it helps, BTW i was at the service today they didn't really recognize the issue but were willing to
help me with my hunch about the seal, it is a start of holiday in Israel so they didn't have the time to do it today so i did it myself (because the wanted to remove the pedals).
http://www.youtube.com/watch?v=8NG2N9n2Fok