Engine dies out when turnon ac or defrostt
Sounds like your compressor has failed and it stalls out your engine when the ac clutch engages. You should stand outside the car and look down at the pulley on the front of the ac compressor. Run the car, and have a friend turn on the AC. If you see the clutch engage and then the pulley doesn't turn, then you have your answer. A new compressor is needed.
Easy fix! Cost you about $9. Remove fuses # 10 and #28 under the hood. Then remove your throttle body and clean it with a sensor safe spray like Seafoam. This will fix your problem.
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