Last week I replaced the lower radiator hose on my girlfriend's 2014 LS 1.8L. That stopped the previous leak, but now it looks like I have one coming from the thermostat housing. It looks like the housing is GM part #25199824. Are there any other parts that connect to this that I should also consider replacing preemptively? I just don't want to be playing whack-a-mole with the cooling system if I can help it. I've read that the reservoir itself is something people usually replace, but I don't currently see any leaking from that area thankfully.