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


t-typeless for 5 yrs..ugh
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?
It's the vacuum circuit making noises (diaphrams moving around)...don't worry about it until something quits working (if ever).