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Hello my name is***** am an ASE Master Technician and I am glad to help you out with your question.
You need to get a code scan of the hvac module. Also check the Freon pressures with a set of gauges. A low pressure switch will cause the compressor to disengage as well. Also a low charge of Freon will prevent the compressor from engaging.
Would you like a wiring diagram of the ac system of your truck?
The computer controls the relay. Could be a wiring connection problem as well.
I can send you a wiring diagram if you like.
Do you still need help?
You could have a compressor problem as well. This would cause your pressure to drop. Also check for expansion valve being stuck. Could have a restriction in the system as well.
If you accept the premium service I can send you a pdf diagram of the ac circuit.
Hello again Dan here,
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