This sound may be caused by your blower motor in the dash. This is a squirrel cage type that forces air through your vents. At times you may hear reverberations or feedback from this blower motor it is more annoying than dangerous.
I do not think it sounds dangerous BUT, without actually seeing your car, I can not tell you positively if it is a dangerous situation or not. If you can produce the sound come on demand, when you are on the road, pass by your auto shop and ask them to take a listen.
〉 Answered on Nov 19th, 2010 by Audra Fordin, Owner at Great Bear Auto Shop
No. Probably a cable or heater control binding
〉 Answered on Nov 19th, 2010 by Barb Petrey, President - DBK Enterprises Inc at Jiffy Lube
The noise may be coming from the Blower Motor, which probably is not a dangerous condition.
However best to have it checked out:) Stop in a Repair Shop and have them take a listen.
Ask your friends for recommendations, there are many great independent shops out there!
Have a Fun Day!
〉 Answered on Nov 22nd, 2010 by Diane Larson, Owner/Manager at Larson's Service
It is not dangerous the only problem is the heater fan motor is probably failing. It will eventually quit all together!
Hope this helps.
Super Girls Auto
〉 Answered on Nov 19th, 2010 by Laurie Sarno, Co-Owner at Super Girls Auto
Most likely you're just hearing your fan make noise. It shouldn't be dangerous, but maybe a sign that the fan is on it's last leg.
I would use it until it stops working and then replace it. Unless it's annoying to you of course.
〉 Answered on Nov 20th, 2010 by Lori Johnson, Owner and Instructor at Ladies Start Your Engines
Normally the squeaking noise is caused from one of
〉 Answered on Nov 20th, 2010 by Pat Fleischmann, Director of First Impressions at Community Tire Pros & Auto Repair