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Water Control Valve Inspection

WARNING: This page is about a different car, the 2002 Mazda B4000, 2002 Mazda B3000, and 2002 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Start the engine and run it at idle speed.
  2. Select mode and check the rod position and vacuum at port A.
    WATER CONTROL VALVE INSPECTION

    Mode MAX A/C A/C Vent Panel/Floor Floor Floor/Defroster Defroster
    Rod position B A A A A A A
    Vacuum at port A YES NO NO NO NO NO NO
  3. If rod position and/or vacuum appearance at port A is not as specifications, check the following:
    • If vacuum at port A appears in MAX A/C mode but rod position is not correct, replace the water control valve.
    • If vacuum at port A appears in A/C, Vent, Panel/Floor, Floor, Floor/Defroster and Defroster modes, check the vacuum control valve.
    • If vacuum at port A does not appear in MAX A/C mode, check for leak in a vacuum line and at the vacuum control valve.
    NOTE: When replacing the water control valve, connect heater hoses to heater control valve properly.
Fig 1: Identifying Water Control Valve Operation
G02673161Courtesy of MAZDA MOTORS CORP.
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