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Pull the wheel,you will find that the brake pad,or after pulling the drum,the shoes are in bad shpe,if not ,check the wheel bearing,but my bet is the shoes,or pads are bad,do A brake job,it will most likely be the problem.
Check your brakes for excessive wear or uneven wear. There are metal objects attached to the brake pads, that when worn they touch the rotors creating a metal squealing sound. This serves as a warning to prevent additional damage to your braking system, replace if pads are worn. If this isn't the case, if 4WD have your shafts, hubs bearings checked, if 2WD have your wheel bearings checked. Hopefully this helps
The noise is most likely the serpentine belt. Check it's condition and that of the belt tensioner. It sounds like the belt is slipping, causing the squealing noise u describe. As the belt warms up, it's getting a better 'grip' and the noise stops. Turning on the heat also turns on the a/c in newer cars, this added drag on the belt (one more component to turn, the a/c compressor) would explain why it happens when u turn on the heat. Is the belt original? If yes, it's time to change it, and check the belt tensioner to make sure it's doing it's job of keeping the belt snug on all the pulleys. Let me know how u make out.