96 chevy Tahoe A/C clutch is not working correctly. (Strange problem)

[SunlitComet]

Something is wrong are you saying there is only one is on the back of compressor and one on the accumulator and none mounted to the refrigerant line mounting block near the service valve?

I did a visual verification on mine and I have all three.

I my also have an error on my side Alldata is not apparently showing a correct diagram for compressor controls. According to parts look up the cycling switch (black body) is on the accumulator, high pressure(red body) in the back of compressor and low pressure (green) on top of compressor. I pulled up an auto zone diagram and the Haynes manual and even there diagrams don't match the other. Based on what I physically saw on my truck I will trust the Haynes for now which shows all three switch and each is tied individually to the pcm. So that means the one you jump is the cycling switch. SOB... based on wire color it say the Haynes manual say it is the low pressure switch is on the the accumulator.

You know what the hell with them all.

this differences are pissing me off.

What, if applicable now, color are the wires of the one you jumped to make it work and exactly where was it.

It sounds like you found the the problem but may have uncovered a previous tampering.

Sorry for the problems did not see this coming.

I eagerly await your response so I can drive myself nuts over these discrepancies. shyco:

BTW any pics possible?

 

[Sarcastic_cook]

That is correct the high side switch is the only one at the compressor on the line mounting block. I can’t remember both of the wire colors but one was dark green and white. The other was a dark color too, I think. I left plenty of wire on both the connecter and harness to reuse if needed. Most of the system looks fairly new, perhaps the previous owner used the wrong parts. I will take another look to be sure and take some pics. So if it had three switches what is the difference between the cycling switch and low pressure switch?

 

[SunlitComet]

The cycling switch according to Alldata:

COMPONENTS
The refrigeration cycle (on and off operation of the compressor) is controlled by a switch that senses the low-side pressure as an indicator of evaporator temperature. The pressure cycling switch is the freeze protection device in the system and senses refrigerant pressure on the suction side of the system. This switch is mounted on a standard service low-side fitting. This switch also provides compressor cutoff during cold weather.

OPERATION
Additional compressor protection results from the operating characteristics of the low-side pressure cycling system. If a massive discharge occurs in the low side of the system, or the orifice tube becomes plugged, low-side pressures could be insufficient to close the contacts of the pressure switch. In the event of a low charge, insufficient cooling accompanied by rapid compressor clutch cycling will be noticed at high outside (ambient) air temperatures.
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LOW REFRIGERANT PRESSURE SWITCH
The low refrigerant pressure switch is located in the low pressure refrigerant line. When pressurized, the switch is closed and allows the compressor clutch relay to energize, feeding battery voltage to the compressor clutch coil. If the pressure drops below 2 psi, the switch opens and cuts off voltage to the clutch. There is a circuit to the Air Conditioning Programmer (ACM) which monitors the state of the switch for diagnostic purposes.