heater noise

my 2003 X5 3.0 - getting a quiet but continuous squeak noise when running the heater. I had a similar issue with the AC this summer - I replaced the Final Stage Resistor which resolved the issue. Any thoughts on a solution or process for diagnosing the issue would be greatly appreciated!

My 2003 325i is making a noise when I turn to the right, not all the time, but enough to notice it. Not a squeal, more like a low squeak. The power steering pump was replaced at 30K, now has 66k on it. Also, when I turn heater or a/c on a kind of crackling noise occurs both when I turn it on and...