BMW 318i 1995 overheating HELP PLEASE!!!?

I would say a mive air bubble, or someone used stop leak in the coolant system and its plugged. I would recomend, if you have the money, take the car to a shop that can pressure fill the coolant system. That will not only remove all air, but will immediately tell you if there is a blockage. If you dont have the cash try this..... Bmw says to bleed the coolant system with the little screw.....well dont, waste of time....fill car up with coolant and run it till hot... let cool and remove your cap....air will escape and your fluid level will lower if there was any air in it after filling it. If so, add more fluid and repeat. I do my own services, and although a pain and a lil time consuming(about a day), I save alot of money.