Does a 1996 Chevy truck have vacuum solenoid actuator?

Yes, a 1996 Chevy truck likely has several vacuum solenoid actuators, depending on the specific model and options. These would control various components like:

* Transfer case (4x4 models): Engaging and disengaging 4-wheel drive.

* Air conditioning system: Controlling vacuum-operated components like blend doors.

* Transmission: Potentially controlling shift functions, although this is less common than in some other vehicles.

* Locking differentials (if equipped): Engaging and disengaging locking differentials.

It's not a single actuator, but rather several small ones scattered throughout the engine compartment and under the truck. To know exactly which ones your specific truck has, you'd need to consult a repair manual or parts diagram specific to your year, make, model, and trim level.