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                                                                                                          AC-99
                                        AIR CONDITIONING   -   PRESSURE SWITCH

                 1                                 PRESSURE SWITCH                                         AC0TR-03


          4          2                             ON-VEHICLE INSPECTION
                 3                                 1.   SET ON MANIFOLD GAUGE SET (See page AC-20 )
                                                   2.   DISCONNECT CONNECTOR FROM PRESSURE
                                                        SWITCH
                                                   3.   RUN ENGINE AT APPROX. 1,500 RPM

                                          I03770



                                                   4.    Magnetic clutch control:
        Magnetic clutch control
                                                         INSPECT PRESSURE SWITCH OPERATION
Low pressure side        High pressure side
                                                   (a) Connect the positive (+) lead from the ohmmeter to termi-
                       ON (Continuity)
                                                         nal 4 and the negative (-) lead to terminal 1.
                                                   (b) Check continuity between terminals when refrigerant
                                                         pressure is changed, as shown in the illustration.
       196 kPa               3, 140 kPa            If operation is not as specified, replace the pressure switch.
(2.0 kgf/cm2, 28 psi) (32.0 kgf/cm2, 455 psi)
OFF (No Continuity) OFF (No Continuity)
                                          Z13470




Except towing package:                             5.    Cooling fan control:
         Condenser fan control                           INSPECT PRESSURE SWITCH OPERATION
                     1, 520 kPa                    (a) Connect the positive (+) lead from the ohmmeter to termi-
                     (15.5 kgf/cm2, 220psi)              nal 2 and the negative (-) lead to terminal 3.
   ON
  (Continuity)                                     (b) Check continuity between terminals when refrigerant
                                                         pressure is changed, as shown in the illustration.
                               OFF                 If operation is not as specified, replace the pressure switch.
                               (No Continity)
      1, 226 kPa                                   6.    STOP ENGINE AND SET OFF MANIFOLD GAUGE SET
      (12.5 kgf/cm2, 178psi)              Z13471   7.    CONNECT CONNECTER TO PRESSURE SWITCH


 Towing package:
      Condenser fan control
                                 ON
                                (Continuity)


    OFF
    (No Continity)     1, 520 kPa
      1, 226 kPa      (15.5 kgf/cm2, 220psi)
      (12.5 kgf/cm2, 178psi)           I05079




2001 SIENNA (RM787U)

                                                                    Author :            Date :             1940

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