rattle tagged posts

March 18, 2015 / Posted in  Cars

I’m happy to say the most annoying sound in the world is finally fixed. If you had the same problem as me, your interior HVAC fan would make a tiny, annoying squeal or squeak or cricket sound or noise or whatever you want to call it when on the lowest two or three speeds. It wouldn’t always squeak, but when it did it was annoying, especially since the car is usually so quiet and refined. You’ll be happy once you too eliminate your BMW X3 fan noise.

BMW X3 HVAC blower motor update:

Unfortunately, my first attempt to fix this failed. It turns out the true fix for this issue is photo documented here...

December 19, 2014 / Posted in  Cars

For about 6 months now I’ve been experiencing a BMW X3 muffler rattle. At first I ignored it but as it became more persistent and embarrassing, I decided to get under the car and troubleshoot it. All the connections under the car were firm and in good condition. What was causing the muffler rattle that sort of sounded like an aluminum can in my exhaust? I also noted, it only seemed to happen on start up, idle, and when the car was under no load decelerating.

I took a video and pasted it below with more details. Basically, there is a baffle in the right exhaust pipe that opens and closes based on a vacuum line. At idle and no load, the baffle closes and it opens once the engine starts winding up. It’s also closed when the car is off...