To be certain, you should:
* Consult a repair manual: A Haynes or Chilton repair manual specific to your 1993 Chevy Blazer SS will have diagrams showing the exact location. This is the most reliable method.
* Use an online parts diagram: Many online auto parts stores (like AutoZone, Advance Auto Parts, etc.) allow you to look up parts diagrams for your specific vehicle. Find the diagram for your engine and look for the CKP sensor.
* Visually inspect the engine: If you're comfortable working on your vehicle, carefully look around the crankshaft pulley area on the passenger side of the engine. The sensor will likely be a small, cylindrical component with a single wire connector.
Caution: Always disconnect the negative battery terminal before attempting any work near the engine.