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If the OP's photo on the right is from the car in question, the part circled in red is not missing anything. However, just below it is the thermistor that reads and helps control the A/C temperature - that is normally a white connector plug (as in the left photo) and it appears to have one wire disconnected. Should be replaced IMHO but I don't think the plug is sold separately from the A/C wiring harness. 
