Machine says #3 cool pack bad what do I do and how much will it cost

clear the code,then swap #3 coil with #2,see if machine now says #2 is bad,if it does,then go buy only one ignition coil.#2 is the 2nd one from the front,#3 is the 3rd one from the front,same side(passenger side).depending on where you buy it is going to depend on the price.scrap yard maybe $15,parts store around $60.00. Dealer will be more..4.6L or 5.4L,take the same coil,you have 8,one per cylinder,one sits on top of each spark plug.