CHEVROLET AIR CONDITIONER NO AIR

I Have A 2005 4.8l Tahoe. Simultaneously My Oil/fuel/engine Temperature/ And Voltage Gauges Stopped Working, Ac Stopped Blowing Cold...

So, The A/c On The Feet Area And The A/c In The Back Seats Works Great, But Air Won't Come Out Of The Dashboard A/c. There Are Vents...