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Home >> Mazda >> 2004 >> B2300 L4-2.3L VIN D >> Repair and Diagnosis >> Heating and Air Conditioning >> Refrigerant Pressure Sensor / Switch >> Description and Operation >> A/C Cycling Switch
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A/C Cycling Switch

A/C CYCLING SWITCH DESCRIPTION




The A/C cycling switch is mounted on a Schrader valve-type fitting on the top of the receiver/drier.
- A valve depressor, located inside the threaded end of the A/C cycling switch, presses in on the Schrader valve stem.
- This allows the suction pressure inside the receiver/drier to control the operation of the A/C cycling switch.
- The electrical switch contacts open when the suction pressure drops to 152 - 193 kPa (22 - 28 psi).
- The contacts close when the suction pressure rises to 276 - 324 kPa (40 - 47 psi).
- When the A/C cycling switch contacts close the signal to energize the A/C dutch is sent to the A/C clutch relay.
- When the A/C cycling switch contacts open the A/C clutch field coil is deenergized and compressor operation stops.
- The A/C cycling switch will control the evaporator core pressure at a point where the plate/fin surface temperature will be maintained slightly above freezing.
- This prevents icing of the evaporator core and blockage of airflow.
- It is not necessary to discharge the refrigerant system to remove the A/C cycling switch.
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