Question about 1996 Cadillac DeVille

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A/C 1996 CADILLAC DEVILLE

WHERE IS THIS CYCLING SWITCH THAT YOU SPEAK OF?

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Ok. Try to locate the A/c dryer. or acummulator.
Is look a aluminium bottle. It's have 2 lines one go to the evaporator. The switch is there. And uses a connector with 2 wires. If you found, before replace make a by pass, if work the compressor, replace the switch.

normally the dryer is located on right side of engine comparment.

Posted on Jul 04, 2008

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Have a 2003 stratus with intermittent A/C works great when on, where is the pressure sensor located?, that may be problem


On this Chrysler product they have an A/C Transducer located on the high pressure hose. The switch has three wires. They also have a thermo sensor located at the evaporator case behind the glove compartment. These two things are the only ones thatA jump in the system is only removing protection the system has. So it will damage your compressor or hoses. Find the compressor follow the high hose to the high pressure switch (transducer) it has three wires. Check under the dash by the glove box and you will see a round platick lid on the case with two wires that is your thermostat (thermo sensor).
control the compressor.

The A/C clutch is controlled by the A/C cycling switch (19E561) and the A/C pressure cut-off switch, which are connected in series. The A/C cycling switch is mounted on the suction accumulator/drier (19C836), and the A/C pressure cut-off switch is mounted in the discharge line at the A/C condenser.

The A/C cycling switch closes when the pressure on the low side of the system reaches approximately 276-324 kPa (40-47 psi). The A/C cycling switch opens when the pressure drops to approximately 163-175 kPa (23.5-25.5 psi), disengaging the A/C clutch. In ambient temperatures below -1° C (30° F), the A/C cycling switch will not allow compressor operation because of low system pressures.

The A/C pressure cut-off switch is used to interrupt A/C clutch operation in the event of high system discharge pressures. The A/C pressure cut-off switch is a single-function switch that controls A/C clutch engagement. When compressor head pressures rise to approximately 2896 kPa (420 psi), the contacts open, disengaging the A/C clutch. When the pressures drop to approximately 1724 kPa (250 psi), the contacts close to allow A/C clutch operation.

This problem can be caused by low refrigerant charge. Check with a manifold gauge set and temperature pressure chart.
The cycling switch is replaceable and there is a Schrader valve on the accumulator port so you do not lose your system charge when replacing. It screws on/off. It is available at any auto parts store. It protects the compressor from low pressure which can be caused by a loss of refrigerant and subsequent lack of lubrication and prevents evaporator freeze up. Replace the switch. It is about $10. The high presure switch is about $25.

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Seems the AC is freezing up after about 30 or 40 minutes. After it unfreezes, it will work fine for another 30 or 40 minutes. I believe that the freon levels are correct.


If you have ice accumulating on the evaporator, there should be no air blowing out the registers because the air will be stopped at the evaporator.
If this is happening, the a/c is not cycling on and off as often as it should. At 70 degrees F, it should cycle on and off about 4 times/minute. Less when hotter.

If not cycling off at all, replace the screw-in pressure switch on top of the accumulator under the hood near the fire wall on passenger side.

report results of test.

The A/C cycling switch is mounted on a Schrader valve-type fitting on the suction accumulator/driver.
  • 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 or low side pressure to control the operation of the A/C cycling switch.
  • The electrical switch contacts open when the suction pressure drops. The contacts close when the suction pressure rises. For specifications regarding operating pressure(s), refer to Section 412-00 .
  • When the A/C cycling switch contacts close, the A/C clutch field coil is energized.
  • 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 airflow.
  • It is not necessary to discharge the refrigerant system to remove the A/C cycling switch.

Jul 28, 2009 | 2002 Mercury Grand Marquis

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Electricity is not reaching the a/c compressor.


If it engages when you bypass, it is not the magnetic clutch.
It could be a relay or the low pressure cycling switch. I would jumper the cycling pressure switch connector. If it runs, I would check to be sure you have enough pressure first with compressor running. If ok, change the cycling switch

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Cycling switch


The low pressure cycling switch is normally open at or below 24 PSI and closes at or above 43 PSI. If you are jumping the switch then it is either bad or maybe out of calibration. You can unlpug the connector and look inside and you should see a screw between the terminals. You can adjust it here,unless the switch is bad.

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the system has a definite leak and should be fixed then the system should be recharged there is a pressure switch that keeps the clutch from engaging when the system is low on freon which keeps from burning up the compressor

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1993 Cadillac Deville Phantom Codes


ECM Output Cycling

This mode can be initiated after "E.9.5" is displayed on the "Fuel Data Center". The display of the "E.9.5" can be reached by depressing the Hi button while Code ".7.0" is displayed. The ECM output cycling mode, Code "E.9.6." turns the ECM's outputs on and off. To enter the output cycling mode, proceed as follows;

The engine must be running.

Turn the cruise instrument panel switch to the on position so that the cruise control outputs will cycle.

Turn the engine off and within two seconds, turn the ignition on.

Enter the diagnostics and display Code "E.9.5".

Depress the accelerator pedal (throttle switch open) and release it (throttle switch closed). The ECM output cycling mode begins as the display switches from Code "E.9.5" to Code "E.9.6."

It is possible to leave the ECM output cycling mode at any time and return to ".7.0" by clearing the ECM and BCM codes. If the display does not advance to Code "E.9.6", refer to Code "E.7.2" of the switch test.

The output cycling mode will end automatically after two minutes of cycling and the display will switch from Code "E.9.6" to Code "E.9.5".

The outputs will cycle on and off every three seconds until the two minute automatic shut off occurs. The only exception to this three second cycle is the cruise control power valve which cycles continuously. If additional output cycling is desired, recycle the throttle switch.

Oct 13, 2008 | 1993 Cadillac DeVille

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