maybe its not an a/c issue,i mean that should be pretty simple to figure out with some gauges hooked up and see what pressures are when the problem occurs,if the system is low on charge you have a leak somewhere. If the pressure appear normal perhaps you have an electrical issue with blend door motors under the dash going to heat. This really shouldn't be that hard. If the dealer cant help there are plenty of great hvac guys at other shops that can probably help.
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