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Home >> Mazda >> 2005 >> B4000 SE, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 611 (Cooling System (2.3L)) >> Thermostat Inspection - 2.3L >> Mechanical Test

Mechanical Test

WARNING: This page is about a different car, the 2005 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the water thermostat.
  2. Check the water thermostat for seating. Hold the water thermostat up to a lighted background. Leakage of light around the thermostat valve at room temperature indicates that a new water thermostat should be installed. Some water thermostats have a small leakage notch at one location on the perimeter of the thermostat valve, which is considered normal.
  3. Immerse the water thermostat in a boiling antifreeze and water mixture.

    Initial-opening temperature: 84-88°C (183-190°F) 

    Full-open temperature: 100°C (212°F) 

    Full-open lift: 3.2 mm (0.126 in) minimum 

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