No. 2 Valve (All Models)

Drain radiator until coolant level is below inlet manifold. Remove hoses from thermo valve and remove valve from inlet manifold. Connect hoses to valve and place valve in container of water with thermometer. Gradually heat water and note temperature at which air will not pass through valve. See Fig 1. If air passes through valve before temperature shown in Thermo Valve/Switch Specifications table, replace No. 2 water thermo valve.

Fig 1: Testing No. 2 Water Thermo Valve

Courtesy of MAZDA MOTORS CORP.