So I have had this little problem for the last few years. When I use the heater in any position I hear a loud whistling sound. Now when I move the temp selector to cold the sound goes away. So I am thinking it is a seal on the blend door. As of now I have been solving the problem by turning up the radio ;>) But I was wondering how hard it might be to troubleshoot that blend door? I am not sure where it is located or if it is easy to get to.. Anyone have any thoughts?
Thanks!
Thanks!