I presume that only cold air comes out when the airco is on?
With emergency brake, you mean the parking brake lever? I have never removed the console, but there are some air tubes going to the rear floor area, so maybe that they are detached somewhere under the console.
JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.