Hey guys ive got sum annoying buzzing sound in the boot, ive been told its my central locking pump. I turn the car on and it will hum on and off at about two second intervals for around 5minutes. Anybody had this problem before? weird huh.

Also, in my engine bay there is a white vacum line which isnt attached to anything. Its behind the engine. Anyone know where this goes?

My cars a 1994 c280.

Thanks in advance