Help please! I just bought a new RDX a few days ago. My wife tried to practice to back in in my building's garage for about 15 minutes .
I found twice that when she tried to back in (reverse，idle speed, or very low speed, the engine suddenly became very very loud. It's much louder than normal.
Anyone has the same problem? Any thought? Is this normal for Acura's car? Or should I go to dealer and check it? What problem it might be? Might be fan or engine problem? I'm so worried, it's a new car. We are having a baby coming soon.
Dealer gave us a discounted price, I'm not sure if it's because they already found this problem.
Thank you so much!

 

My guess is that it was the cooling fan and it is normal. When the engine becomes too hot, the fans start spinning very fast and they make a bit of annoying noise. From the inside of the car is not that bad, but if you're standing outside, next to the engine, it's pretty loud.