I have what sounds like a fan noise in my cab above my break it just started I h on 2005 Ford F-150

2005 ford f 150 6 cylinder with ac

Asked by for the 2005 Ford F-150
Possible vacuum leak at the rear of the brake booster. Brake pedal feel ok and not harder to push?
Sometimes a little tough to push
Have a mechanic check the brake booster.
I will do just that thanks bro much appreciated
You bet.