However, it's generally located underneath the dashboard, near the passenger side. You'll likely need to look for it in the area where the HVAC system is located. Expect to have to get down under the dash. The hose will be relatively small-diameter and usually black plastic or rubber tubing. It may drain into a collection tray or directly to the outside of the vehicle.
To find it, you might need to:
* Consult a repair manual: A Haynes or Chilton manual specific to your 1999 Chevy Blazer will provide diagrams showing the AC system's components and the drain line's routing. This is your best resource for precise location.
* Look online: Search for "1999 Chevy Blazer AC evaporator drain location" along with your specific trim level (e.g., "1999 Chevy Blazer 4-door AC evaporator drain location"). You might find photos or videos from someone who's already done this repair.
* Visually inspect: Carefully remove the passenger-side lower dash panel or any panels obstructing access to the area under the dash near the firewall. You may need to remove some trim pieces. Be careful not to damage anything.
* Follow the condensation: If your AC is running and creating condensation, you might be able to trace the water droplets to locate the hose. This is more challenging.
Caution: Working under the dash requires some mechanical aptitude. If you're not comfortable with this, it's best to take your Blazer to a qualified mechanic.
