Safari Van M V6-262 4.3L VIN Z TBI (1990)
![background image](/gmc/safari_van_m/v6-262_4.3l_vin_z_tbi/Page-1587001.png)
Air Conditioning Switch: Description and Operation
The air conditioning "On" signal informs the ECM the A/C selector switch is turned on, and the A/C pressure cycling switch is closed. Using this
information, the ECM adjusts the engine idle speed as necessary to ensure a smooth idle.