I found out there are 2 types:- 3 speed and 4 speed automatic
http://www.internetautoguide.com/car-specifications/09-int/1996/toyota/corolla/index.html
Wondering if any of you have experienced this before. When I turn my air con on there is a sort of whirring/ grinding sound coming from around the middle of the engine bay, more towards the drivers side...