Thermostat Inspection

WARNING: This page is about a different car, the 2001 Mazda Millenia and 2001 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.

Visually check that the thermostat valve is airtight.
Place the thermostat and a thermometer into water.
Heat the water and check the following:
- initial-opening temparature 176-183 degrees F (80-84 degrees C)
- Full-opem temperature 203 degrees F (95 degrees C)
- Fully open lift 0.33 in. (8.5 mm)

Fig 1: Thermostat Lift Measurement Area

Courtesy of MAZDA MOTORS CORP.