So for about a year now, my driver side air conditioner has had a problem where the air will suddenly blow hot while driving. The truck has the dial climate control for driver and passenger. The passenger side is okay, always cold. I took it to the dealership and they told me it was a part called a blend door or something. I'm just looking for either a confirmation or a second opinion on this issue before i go buy one of these parts. (The valve is almost $300).

Also, to fix the issue, I'll restart my truck and the problem will go away for awhile.

Opinions welcome.

Thanks,
Andrew