heater/defroster making noise when i turn off the car...anyone have this problem??

[Oaktown]

when i turn on my heater/defroster it works and everything but when i turn the car off it still makes noise until i turn it off or play with the switches... it sounds like it keeps runnin barely or has some weasing noises...its always something...what is the deal with this? anyone had this?

 

[zam70]

It's the vacuum circuit making noises (diaphrams moving around)...don't worry about it until something quits working (if ever).