To be sure, you should:
* Consult your vehicle's repair manual: This is the most reliable source for the exact location. A Haynes or Chilton manual will be very helpful.
* Use an online parts diagram: Many auto parts websites (like AutoZone, Advance Auto Parts, etc.) allow you to select your year, make, and model and view diagrams showing the location of parts. Search for a "parts diagram" for your specific 2000 Mazda 626.
Without knowing the precise engine size, pinpointing the location more accurately is difficult. But the general area described above is a good starting point for your search. Remember to be cautious when working near the engine.