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Welcome, I'm Chris (aka Moose) I prefer to work when others don't, I am here around lunch and after dinner till after midnight.
So once the vehicle is at operating temp the AC intermittently works. Does this intermittent issue only occur in park or at idle in the drive light at a read light? Do you get the intermittent AC issues when driving?
Active relays that turn on and off often or those staying on will get very hot.
Are you able to get it hot, and do some electrical testing at that time when the AC is commanded on but not working?
Will the vehicle stall when not using the AC?
Do you own a AC pressure gauge set to monitor the AC pressures?
In park, at operating temp, with the rpms held at 1500. AC on max, blower speed on 2.
Tell me the max and min low and high side pressures as the gauges move up and down with the compressor turning on and off.
During this test tell me the outside air temp and the dash output vent temp.
One possible cause for stalling at idle on this model is a dirty sticking throttle plate. Can you try cleaning it with a tooth brush and brake cleaner.
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Hello again Chris here,