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                                                                                                      AC-25
                                    AIR CONDITIONING   -   FRONT COOLING UNIT


FRONT COOLING UNIT
                                                                                                       AC3BJ-01


ON-VEHICLE INSPECTION
1.    INSPECT FOR LEAKAGE OF REFRIGERANT
(a)   Remove the lower No. 2 finish panel (See page BO-101 ).
(b)   Remove the blower resistor.
(c)   Using a gas leak detector, check for leakage.
      If there is leakage, check the tightening torque at the joints or check the evaporator.
(d)   Install the blower resistor.
(e)   Install the lower No. 2 finish panel (See page BO-106 ).
2.    INSPECT EXPANSION VALVE
(a)   Check quantity of gas during refrigeration cycle.
(b)   Set on manifold gauge set.
(c)   Run engine.
      (1) Run the engine at 1,500 rpm for at least 5 minutes.
      (2) Then check that the high pressure reading is 1.37 - 1.57 Mpa (14 - 16 kgm/cm2, 199 - 288 psi).
(d)   Check expansion valve.
      If the expansion valve is faulty, the low pressure reading will drop to 0 kPa (0 kgf/cm2, 0 psi).
HINT:
When the lower pressure drop to 0 kPa (0 kgf/cm2, 0 psi), feel the receiver's IN and OUT sides for no temper-
ature difference.




 2001 SIENNA (RM787U)

                                                                 Author :          Date :              1866

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