There are a couple of things to consider. If the bottom hose was cold it gives the impression that the radiator is plugged. The oil seeping tells me to look for possible head gasket trouble. Honda cars are known for people overlooking the air pocket. There is a air valve on the water system that needs to be purged. If you ran the car low on fluid and just put fluid in and did not purge the system there could be air trapped, causing it to overheat. There are some other things but I am assuming no one has played with the wiring.