Heat Whistles

[cindyv10]

I have a 2003. Whenever I have the heat on, there's a high-pitched whistle that drives everyone in the car crazy. I can adjust the heat/fan controllers to minimize the whistle, but it's still there. It sounds like some kind of obstruction, but I've had a new heater core put in and work done on it to look for the source of the noise, but there doesn't seem to be any reason for it. I've also noticed that when I have the fan control on high, the heat control knob slams to max - as if maybe something isn't connected. Maybe you're just not supposed to have the fan on high with the heat on, but still... Is mine the only one that does this? Also the air flow isn't as strong when it's on heat compared to vent. I imagine that may be normal, but I've never noticed a significant drop in airflow with other cars I've had. Any ideas?

[CREWZIN]

Sounds like you might have an obstruction in the air flow channeling which might also be the whistling noise....and NO, it's not normal and the flow for the heat should be just as much as the cold or vent.

[randyincctx]

Tip: If you can post a sample(Video,WAV)and let some of us hear the sound,it might help........Whistle,Whine,Buzz,Squeal,Etc. these are all subjective sounds.(One girl's 'whistle',is a another man's 'whine'.LOL)

[soonercruiser]

Maybe leaves of something...ESPECIALLY if you don't have a cabin air filter installed.
I just purchased a 2005, and when I took off the plastic cowls near the wipers to access the windshield wash reservoir and install a cabin air filter there; it was full of leaves. Luckily, nothing in the ducts!

[pt06]

Cindy; it could be a vacuum leak in a hose or a vacuum motor diaphram. Or a dry fan motor bearing, which would change in pitch with the fan motor speed.