Loud whining noise almost a howling noise coming from front passenger side gets worse the hotter the car gets
heater blower squirrel cage rubbing objects drawn in the cowl vent
wait, the passenger side! that's the accessory side including the power steering pump. check for low power steering fluid
Could it b ac moter
if its intermittent ,the a, c. pump only kicks in with air on and defrost, at heat it would be idle
Gina, That happened to my 2002 LeSabre also, after I got it back from the mechanic for another problem. It went away by itself after a while, but now I have intermittent blowing of the motor. The air blows cold, but the fan only blows occasionally. I'm getting that checked out soon with mechanic. Sorry, but I don't really know what caused the howling sound, but I know what you mean. I didn't notice it louder with the car hotter, just with the fan on high.
I would get the AC unit checked.
Looking for a Used LeSabre in your area?
CarGurus has 1,876 nationwide LeSabre listings starting at $1,588.
Search Buick LeSabre Questions
Buick LeSabre Experts