PeachParts Mercedes-Benz Forum - View Single Post - W201 Squealing Interior Sound in Cold Weather

BENZ-LGB · #4 12-22-2008, 01:12 AM

Quote:

Originally Posted by BrianBH

My god that was quick!

Thank you, for I now know what it is. Should I worry about it, given that we average perhaps a week's worth of below zero days in a year?

Brian, how loud is the noise? The fan that power the aspirator is a very small electrical fan - smaller than even the fan in a laptop.

If you do a check under "heater blower fan noise" you may find that the heater blower fan makes a loud, squealing sound when the bearings are going. The noise usually is most noticeable at low fan speed and when it is cold.

Try turning on the car with the A/C and heater off and see if the noise is present. If the noise is present with the A/C and heater off then MTI's diagnosis is correct. If there is no noise with the A/C - heater off, then it may be the heater blower fan at fault.

Good luck up in the frozen tundra.