I have a 2007 Acura MDA. It is working perfectly except for an intermittent chirping sound which seems to be coming from the passenger side speaker. After I start the car, it chirps once, then again in 3 minutes, then again in 3 minutes, then in about 4 minutes. Then I don't notice the noise anymore (or I loose focus and stop listening). This has been going on for about a month, which coincides with when I first started using the a/c this year.