What did he do? Just go in a start cutting wires? The HVAC is a seperate system from the computer harness. Just one big red wire supplies power for everything. The connector is up under the right side of the dash. Verify you have 12 volts there. But I think you'll find the problem is under the hood. Where is the big red wire at under there? The main supply wire was part of the engine harness getting it's 12 volts from a fusible link on the starter.