Pag hindi pa gaano mataas ng temp level ng makina, most mechanics would recommend shutting the aircon off, but keep the engine running. Pop the hood open. Then to disperse the heat quickly, turn the aircon thermostat to the maximum HOT (usually colored red) position. Dapat bukas ang blower.

Let it cool normally, hindi rin daw advisable yung paglagay ng tubig sa radiator (yung bang parang pinapaliguan, while the rad cap is still attached).

But this method is on the premise na hindi naman malaki yung tagas sa radiator. Kung malakas kasi magbawas ng tubig, dapat pinapatay yung makina, and pop the hood.