Firebird V8-305 5.0L (1982)
![background image](/pontiac/firebird/v8-305_5.0l/Page-1423001.png)
Air Conditioning Switch: Description and Operation
Switch signals the Engine Control Module (ECM) when the A/C compressor clutch is engaged--12 volt sensed at ECM.
The ECM increases throttle opening--by actuating the Idle Speed Control (ISC) Motor--to compensate for the increase in engine load.
When the compressor clutch is disengaged, switch output voltage is 0 volts.