1. Mazda 626 (1983-1991) 2.0L I4 Engine:
- The thermostat is located in a housing on the upper radiator hose, near the thermostat housing assembly.
2. Mazda 626 (1992-1997) 2.5L V6 Engine:
- The thermostat is located in a housing at the front of the engine, underneath the upper radiator hose.
3. Mazda 626 (1998-2002) 2.0L I4 Engine:
- The thermostat is located inside a housing on the coolant outlet pipe, which connects the engine block to the upper radiator hose.
4. Mazda 626 (2002-2007) 2.3L I4 Engine:
- The thermostat is situated inside a housing on the coolant outlet pipe, near the engine block.
It's important to note that the specific location of the thermostat may vary slightly based on the exact year and trim level of your Mazda 626. If you're unsure of the exact location of the thermostat or need further assistance, it's recommended to consult your vehicle's service manual or seek help from a qualified mechanic.