I took my 2018 malibu in for an oil change and the check engine light was on. Oil, air filter and cabin air filter were all changed. They said the check engine light was caused by the fuel pump wiring harness was chewed by an animal. Two weeks and $800 later, I finally get my car back. When you turn the AC on high, there is a loud vibrating noise coming from the dash. Of course they cant get me back in until next week. Any suggestions on what is causing the noise and vibration?