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Home >> Mazda >> 1977 >> GLC Base, Standard Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Emissions System - Exhaust Gas RECIRCULATION >> Testing >> Water THERMO Switch >> 1979 Models
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1979 Models

  1. Remove switch from vehicle and place in container of water with thermometer. Suspend parts in water so they do not touch side of container. With vacuum hoses attached to fittings, blow into either hose.
  2. Air should NOT pass while water thermo valve is below 121°F (50°C); below 138°F (59°C) for 626. If it does, replace valve. Heat water to above temperatures mentioned. Blow into hose. Air should now pass through valve. If not, replace valve.
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