Weird AC Issue

[Fifty150hs]

Hi Guys. 2006 3.0 with an odd problem, a couple actually.

1. Every so often when I start the X with the AC on it makes a loud "whoooot" sound behind the dash. Only happens once and the AC works fine after that.

2. It has been super hot here (for the SF Bay Area) and in the high 90's, low 100's. When I fire it up after it has been sitting and the inside is an oven I put it on MAX and it will start to blow cold and then it doesn't, until I start driving. It then starts to cool down, until I have to stop at a light, it then starts not cooling well until I move again. The electric fan is working, in fact it is howling it is running so fast. I put a gauge and refill can on it (I don't have AC equipment) and it shows good pressure on the low side. The manual says it shouldn't be above 35 psi ever. It's at 35. Any ideas? Would a failed fan clutch cause this?