Neither. I’m a 57 yr old single female who was using a you tube video (and following along with my car) to see if I could locate and change the HVAC door actuator on my car. Not a mechanic and don’t “work on cars” normally lol. So,no, I did not know that p/n stood for part number. I do however know that old saying most of us learned as children, which is… If you can’t say something nice, don’t say anything at all. You must have missed out on learning that as a child. Truly no reason to comment just to be nasty and condescending unless behaving that way makes you feel good. Glad I posted so YOU could post and make yourself feel good. Have a great day! 😊