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Air Conditioning › Components › Low Side Switch
Air Conditioning Low Pressure Switch:
The A/C cycling switch(low pressure switch) is mounted on a Schrader valve-type fitting on the top of the suction accumulator. 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 suction accumulator to control the operation of the A/C cycling switch. When the A/C cycling switch contacts close, the signal to energize the A/C clutch is sent to the constant control relay module. When the A/C cycling switch contacts open, the A/C clutch field coil is de-energized and compressor operation stops. The A/C cycling switch will control the A/C evaporator core pressure at a point where the plate/fin surface temperature will be maintained slightly above freezing. This prevents icing of the A/C evaporator core and blockage of air flow. |
DIAGNOSE |
The electrical switch contacts open when the suction pressure drops. The contacts close when the suction pressure rises. If the System is low on freon switch will remain Open and not kick on the compressor! |
REPLACE |
This should be done by a qualified technician only. The A/C System does not need to be evacuated first. For Vehicle specific removal procedures get an Online Repair Manual |
| AIR CONDITIONING HOME REPAIRS AND TESTS |
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