I have a 2005 Ford Mustang V6 with 75k miles on it. I bought it about a year ago and when winter started i began to hear a weird, loud, high pitched noise when I started the car. I wasn’t able to figure out what is was but I assumed it was the starter. Once it became warm out again the car stopped making the noise but then (towards the start of summer) I started to hear the noise again.
Some people said online or in person that it was the starter while others said it was the AC and I just need to make sure I don’t start the car with the AC on. I tested different things and found that whenever I turned on the electricity, then turned the AC on, then turned the car all the way on that it didn’t make the noise (weirdly). That was about a week ago but now the car makes the noise loudly no matter what I do. I took a video of the noise (link below) and was wondering if anybody could help.