My 2008 Honda Pilot started making a slight noise through the air vents around the beginning of the year. Nothing loud or concerning. I just thought it was the sound of the fan. In July my AC quit working. The air was mildly cool at best. I used a recharge can which wore off after a few hours. I didn't think to try the heat. Just assumed I had a leak and would fix it as I had more funds. Now the colder months have come and I notice when I turn the heat on it makes the same noise and does not heat up. If I turn the defroster on a warm temp the whole car will heat up just fine, so the defroster is getting hot enough. I'm just not the most savvy and want to know if anyone knows what the issue might be. Thanks!