However, it's almost always located underneath the vehicle, near the firewall, and somewhere in the vicinity of the evaporator core. The evaporator core is inside the passenger compartment, and the drain line runs from it to the outside.
To find it, you'll likely need to:
* Consult a repair manual: A repair manual specific to your S-10's year and model will give the precise location.
* Look near the firewall: Get under your truck, and carefully examine the area of the firewall on the passenger side. The drain line might be a small rubber hose or a plastic tube.
* Follow the path: If you can locate the evaporator core (often behind the glove box or dashboard), tracing any tubing coming from it downwards should lead you to the drain.
* Look for signs of moisture: After running the A/C for a while, check for damp or wet spots under the truck near the firewall, this could indicate the location of the drain.
Be cautious when working under your vehicle. Use jack stands for safety and wear appropriate safety gear.