ventilation fan noise - help, please!
Have a '94 E420 and have noticed two distinct fan noises when the ventilation system is on low speed. One seems to be the fan itself, the other is a constant, somewhat ticking sounding noise in the dash, center vent area? Any thoughts on what it could be and how to fix it? Also posted this on the tech advise board, no repsonses yet.
Thanks in advance!
1990 300 TE, I get that tick....tick.....tick noise sporadically. The fan speed does not change the rate of the tick, so it is not the fan...I dont think anyway. I removed the glove box, and the tick seems to be coming from about dead center inside that middle vent structure thing. My best guess is that some vent is trying to open or move, and that sound is a vacuum solenoid trying to pull or push.
I do not see how to get in there, but wonder if there is something you can put in the vacuum line to make it more efficient. Since my cruise control is also sporadic, I am thinking that I may have a small vacuum leak somewhere in the system.



