Bmw e34 535i 1991 overheats
 

Hi guys!!!
I'm currently having problems with my car, it overheats.
Please can someone tell me where does the radiator tank hose leads to, no the one on the left hand side (on the right hand side drive cars), i don't think it should be lose, it goes nowhere in my car i just need to know where it goes, it's like a breathing hose. Thanks.

They both go to the engine if im not wrong