2005 E500 high-pitched fan sound
#1
2005 E500 high-pitched fan sound
I recently noticed a high-pitched fan sound in the interior of my E500. Does the Command hardware have a cooling fan? Should I be able to hear it?
#2
The blower for the HVAC system is very prone to bearing failure. Squealing is usually more noticeable at lower fan speeds. If you investigate and this proves to be the problem, they can be purchased from parts houses as a BEHR OE replacement. They are under $150 unless the speed controller fails (it can be purchased separately). I don't think the replacement part is an improvement, just stops the noise for a few years. I posted a picture write up for the replacement. Good Luck, I may be completely off track about the source of the problem