I have implemented Always ON, here is the configuration

I have 3 node cluster , 1 with stand alone sql server and 2 nodes are HA active/passive sql server cluster. all three nodes are in same subnet

now i want to add another node for DR which is at some other location with different subnet. (Stand alone sql only)

i have the following question

will adding new node to the existing WINDOWS cluster bring down services in the cluster?