2006 Ford Freestyle Whistling after AC job

Hello
The car came out of an ac job and there are two problems. One is that the passenger side blows cool air but not cold, and the driver is cold. The other problem is that there is a whistling sound randomly while driving. It just happens. It is like a high pitch sound

Parts installed
Compressor
Drier
valve

Ac was flushed completely

Side note front brakes and rotors were also done but brake perfectly

Any help is gladly appreciated