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I am sorry that you have not been helped yet. I just came online and saw your question.
Ok, first, I need some type of detail on the connector. - where is it located, shape of connector, color of wires, etc. A photo would be even better. you can use the paperclip icon to upload one.
Yes, the pressure sensor on the ac line can cause the cooling fan to not come on if it is faulty, but before that, we need see where the connector goes to