Switch that closes and opens the door for changing of air flow conditioner on a Chevy s10 is bad?

If the switch that controls the airflow to your Chevy S10's air conditioner isn't working properly (closing and opening the door as expected), then yes, the switch is likely bad. It could be a problem with the switch itself, the wiring to the switch, or even a problem with the actuator motor that actually moves the blend door (the door that controls airflow).

To determine the exact cause, you'll need to troubleshoot. A mechanic can easily diagnose this, but you might be able to check a few things yourself:

* Check the fuse: Make sure the fuse for the climate control system is not blown.

* Inspect the wiring: Look for any obvious damage to the wiring harness going to the switch.

* Test the switch (advanced): You'd need a multimeter to test the switch's continuity to see if it's sending the correct electrical signal when activated. This is more difficult for a DIYer.

If you're not comfortable working with car electronics, it's best to take your S10 to a qualified mechanic. They can properly diagnose the problem and replace the faulty component (switch, wiring, or actuator). Replacing the switch is usually a relatively straightforward repair.