Auto Air Conditioning & Heater Repair: HVAC system not working, ventilation air, cadillac escalade

Question
I have a 1999 Cadillac Escalade. I just installed a new radio to the car. Now the AC/ Heater does not work. It only blows air up the windshield vents. The other vents do not blow air. The air is neither hot or cold. The air is probably ventilation air.

Answer
Hi Frank

I would start by checking behind radio to make sure all connections to the control are good.
If they worked with the battery on then I would disconnect and reset the computer to make sure nothing was shorted out during the installation.  Let me know and I'll try and help