Problems when I turn the ac/heat control on
 

My step dad has a 2004 ford f150 4x4 5.4 and as soon as i turn the ac/heat control on to any setting several issues pop up. #1 neither the heat or the ac works, #2 radio loses power, #3 the turn signals and high beam light stay light, #4 turn signals do not work and #5 the truck will not come out of park. If I turn the ac/heat control back to the off position, turn the truck off and restart it its fine until it's turned on again. Any ideas on what to check first? Thanks!