Constant clicking when A/C or heat is on
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What is the outside air temp? If it is cool then there will no be effective heat transfer in the evaporator. The colder it gets, the more this will happen. It is normal for it to cycle on and off frequently in the cold weather. Cold does not have to be 32 deg either. 60 deg will cycle the compressor frequently.
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what i said above is correct
#12
The A/C compressor cycles because the a/c pressure (ACP) switch tells it to so the evaporator doesnt freeze. if there is high load on the system (warm or humid day) the pressure drops slower so it cycles longer. if the system is low on charge or there is low load on the system, the compressor cycles fast
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/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 clutch is sent to the wide open throttle A/C cutoff 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 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 airflow.
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/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 clutch is sent to the wide open throttle A/C cutoff 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 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 airflow.
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irobb (04-10-2022)
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