i need help to replace the ac resistor.

www.alldatadiy.com

poss under warranty at dealer

If u are talking about the blower motor risistor, it ubder the glove box where the blow motor is it bolts to the bottom of the blowe motor case, it has to screws u can't miss it.

Just get the service manual and there you will find step by step instructions. http://infoservicemanuals.com/nissan-armada-service-repair-manual-download/