You'll be disappointed to hear that these are NOT factories but more like mechanic shops and/or importers. The only internship you can get there is being an assistant to a mechanic (a chota to an ustaad) for changing engine oil, air filters, etc.
No company in Pakistan is doing any sort of design or development work. If you need automotive flavor, try PakSuzuki or Indus or Honda Atlas. You still will not be doing any automotive work but be attached with an engineer that oversees the companies' machinery in their production line like the mould machines, milling machines, press machines, paint machines, etc.