Musky smell

[bigbobus2003]

I have a 2005 GMC Envoy and i have a musky smell. The thing is i only get the smell when i am drivin with the sunroof open. I checked the 2 front drains of the sunroof they r draining fine. Is there rear drains for these also? Or any ideas where it is coming from or what could be causing the smell?

[jpartin98]

You might want to have the cabin filter checked. My mom had the same problem and after having the cabin filter checked, it fixed the problem.