With automatic temperature control and the conventional AC system both at work here, you have to determine where the problem lies -- in the function of the compressor and refrigerant system itself, or within the EATC unit that controls hot and cold temperature blending.
If it is your base AC -- that is, compressor, lines, accumulator, manifold, condenser, etc... you will know as the compressor will either not turn on at all, or will turn on and off quickly, indicating a charge issue. Or, in some cases, it may run and run and run and the evaporator may freeze over, keeping cold air from blowing. This can be due to a faulty cycling switch, for example.
With the EATC system, you could have a temperature sensor issue, a temperature blend door actuator issue or a controller issue.
Hopefully your specialist will be able to catch the problem in the act at some point. Good luck.
Hello, your specialist isnt spending enough time finding the true problem, yes these can be very tricky sometimes and require extra time to check pressure and temps correctly.
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Thanks for the input - very helpful! I'll pass your information along to my A/C specialist to follow.