timing and terminals for : vancouver to Beijing then connecting: fly to islamabad

I will be flying in to PEK from Vancouver, Canada and have only 1 hrs 25 mins to get to a connecting flight to Islamabad with Air China. Can someone please tell me what terminal I will be landing in from Vancouver and which terminal I will have to go to to fly to islamabad wit Air China? Will that be enough time to connect in such a big airport!? is it easy to navigate through PEK, ie english signage and english speaking agents? thank you for any help.